"Network unidentified" on Ethernet computers

Sometimes I get "Network unidentified" on my computer.
No IP from DHCP, actually there is nothing except the gateway address and WINS server addess.

When I restart the network card or unplug the Ethernet cable everything is fine.

LOG:

Mon Apr 24 17:17:13 2017 daemon.info odhcpd[1034]: Using a RA lifetime of 0 seconds on br-lan
Mon Apr 24 17:17:17 2017 daemon.info odhcpd[1034]: Using a RA lifetime of 0 seconds on br-lan
Mon Apr 24 17:17:21 2017 daemon.info odhcpd[1034]: Using a RA lifetime of 0 seconds on br-lan
Mon Apr 24 17:17:25 2017 daemon.info dnsmasq-dhcp[1972]: DHCPREQUEST(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:17:25 2017 daemon.info dnsmasq-dhcp[1972]: DHCPACK(br-lan) 192.168.2.149 48:5b:39:09:a5:29 Desktop-PC_Ethernet
Mon Apr 24 17:17:25 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:17:25 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:17:25 2017 daemon.info dnsmasq[1972]: read /etc/hosts - 5 addresses
Mon Apr 24 17:17:25 2017 daemon.info dnsmasq[1972]: read /tmp/hosts/odhcpd - 4 addresses
Mon Apr 24 17:17:25 2017 daemon.info dnsmasq[1972]: read /tmp/hosts/dhcp.cfg02411c - 6 addresses
Mon Apr 24 17:17:25 2017 daemon.info dnsmasq-dhcp[1972]: read /etc/ethers - 0 addresses
Mon Apr 24 17:17:26 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:17:26 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:17:28 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:17:28 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:17:29 2017 daemon.info dnsmasq-dhcp[1972]: DHCPREQUEST(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:17:29 2017 daemon.info dnsmasq-dhcp[1972]: DHCPACK(br-lan) 192.168.2.149 48:5b:39:09:a5:29 Desktop-PC_Ethernet
Mon Apr 24 17:17:32 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:17:32 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:17:38 2017 daemon.info dnsmasq-dhcp[1972]: DHCPREQUEST(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:17:38 2017 daemon.info dnsmasq-dhcp[1972]: DHCPACK(br-lan) 192.168.2.149 48:5b:39:09:a5:29 Desktop-PC_Ethernet
Mon Apr 24 17:17:40 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:17:40 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:17:50 2017 daemon.info odhcpd[1034]: Using a RA lifetime of 0 seconds on br-lan
Mon Apr 24 17:17:53 2017 daemon.info dnsmasq-dhcp[1972]: DHCPREQUEST(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:17:53 2017 daemon.info dnsmasq-dhcp[1972]: DHCPACK(br-lan) 192.168.2.149 48:5b:39:09:a5:29 Desktop-PC_Ethernet
Mon Apr 24 17:17:56 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:17:56 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:17:59 2017 daemon.info dnsmasq-dhcp[1972]: DHCPREQUEST(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:17:59 2017 daemon.info dnsmasq-dhcp[1972]: DHCPACK(br-lan) 192.168.2.149 48:5b:39:09:a5:29 Desktop-PC_Ethernet
Mon Apr 24 17:18:00 2017 cron.info crond[1067]: USER root pid 11538 cmd /etc/scripts/restartowanie_internetu; /etc/scripts/restartowanie_dnscrypt; /etc/scripts/restartowanie_vnstat
Mon Apr 24 17:18:08 2017 daemon.info dnsmasq-dhcp[1972]: DHCPREQUEST(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:18:08 2017 daemon.info dnsmasq-dhcp[1972]: DHCPACK(br-lan) 192.168.2.149 48:5b:39:09:a5:29 Desktop-PC_Ethernet
Mon Apr 24 17:18:28 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:18:28 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:18:32 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:18:32 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:18:36 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:18:36 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:18:45 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:18:45 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:18:58 2017 daemon.info dnsmasq-dhcp[1972]: DHCPINFORM(br-lan) 192.168.2.125 b4:74:9f:73:59:3f 
Mon Apr 24 17:18:58 2017 daemon.info dnsmasq-dhcp[1972]: DHCPACK(br-lan) 192.168.2.125 b4:74:9f:73:59:3f Adrian-ASUS_WiFi
Mon Apr 24 17:19:01 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:19:01 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:19:30 2017 daemon.info dnscrypt-proxy[2742]: dnscrypt-proxy Refetching server certificates
Mon Apr 24 17:19:30 2017 daemon.info dnscrypt-proxy[2742]: dnscrypt-proxy Server certificate with serial '0001' received
Mon Apr 24 17:19:30 2017 daemon.info dnscrypt-proxy[2742]: dnscrypt-proxy This certificate is valid
Mon Apr 24 17:19:30 2017 daemon.info dnscrypt-proxy[2742]: dnscrypt-proxy Chosen certificate #808464433 is valid from [2016-09-08] to [2017-09-08]
Mon Apr 24 17:19:30 2017 daemon.info dnscrypt-proxy[2742]: dnscrypt-proxy The key rotation period for this server may exceed the recommended value. This is bad for forward secrecy.
Mon Apr 24 17:19:30 2017 daemon.info dnscrypt-proxy[2742]: dnscrypt-proxy Server key fingerprint is 72DF:BE14:531F:F2AD:FD0F:BC8B:F711:B93D:799F:E4D0:34EC:D26B:8BF9:FFA9:32E7:2B79
Mon Apr 24 17:19:32 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:19:32 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:19:35 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:19:35 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:19:42 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:19:42 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:19:58 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:19:58 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:20:00 2017 cron.info crond[1067]: USER root pid 12143 cmd ntpdate 194.29.130.252
Mon Apr 24 17:20:59 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:20:59 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:21:00 2017 cron.info crond[1067]: USER root pid 12439 cmd /etc/scripts/restartowanie_internetu; /etc/scripts/restartowanie_dnscrypt; /etc/scripts/restartowanie_vnstat
Mon Apr 24 17:21:02 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:21:02 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:21:09 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:21:09 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:21:37 2017 daemon.info odhcpd[1034]: Using a RA lifetime of 0 seconds on br-lan
Mon Apr 24 17:21:52 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:21:52 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:21:55 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:21:55 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:22:03 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:22:03 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:22:18 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:22:18 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:22:51 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:22:51 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:22:55 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:22:55 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:23:03 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:23:03 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:23:19 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:23:19 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.149 48:5b:39:09:a5:29 
Mon Apr 24 17:23:39 2017 daemon.info dnsmasq-dhcp[1972]: DHCPINFORM(br-lan) 192.168.2.125 b4:74:9f:73:59:3f 
Mon Apr 24 17:23:39 2017 daemon.info dnsmasq-dhcp[1972]: DHCPACK(br-lan) 192.168.2.125 b4:74:9f:73:59:3f Adrian-ASUS_WiFi
Mon Apr 24 17:24:00 2017 cron.info crond[1067]: USER root pid 13580 cmd /etc/scripts/restartowanie_internetu; /etc/scripts/restartowanie_dnscrypt; /etc/scripts/restartowanie_vnstat
Mon Apr 24 17:24:32 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:24:32 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:24:33 2017 daemon.info hostapd: wlan0: STA b4:74:9f:73:59:3f WPA: group key handshake completed (RSN)
Mon Apr 24 17:24:33 2017 daemon.info hostapd: wlan0: STA 34:e6:ad:d7:bc:bb WPA: group key handshake completed (RSN)
Mon Apr 24 17:24:33 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:24:33 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:24:35 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:24:35 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:24:39 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:24:39 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:24:47 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:24:47 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:25:03 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:25:03 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:25:35 2017 daemon.notice odhcpd[1034]: Got DHCPv6 request
Mon Apr 24 17:25:35 2017 daemon.warn odhcpd[1034]: DHCPV6 SOLICIT IA_NA from 00010001202e1502485b3909a529 on br-lan: ok fdc2:97e1:61e5::149/128 
Mon Apr 24 17:26:09 2017 daemon.info hostapd: wlan0: STA 48:59:29:cf:f6:7e IEEE 802.11: authenticated
Mon Apr 24 17:26:09 2017 daemon.info hostapd: wlan0: STA 48:59:29:cf:f6:7e IEEE 802.11: associated (aid 2)
Mon Apr 24 17:26:09 2017 daemon.notice hostapd: wlan0: AP-STA-CONNECTED 48:59:29:cf:f6:7e
Mon Apr 24 17:26:09 2017 daemon.info hostapd: wlan0: STA 48:59:29:cf:f6:7e WPA: pairwise key handshake completed (RSN)
Mon Apr 24 17:26:09 2017 daemon.info dnsmasq-dhcp[1972]: DHCPDISCOVER(br-lan) 48:59:29:cf:f6:7e 
Mon Apr 24 17:26:09 2017 daemon.info dnsmasq-dhcp[1972]: DHCPOFFER(br-lan) 192.168.2.225 48:59:29:cf:f6:7e 
Mon Apr 24 17:26:09 2017 daemon.info dnsmasq-dhcp[1972]: DHCPREQUEST(br-lan) 192.168.2.225 48:59:29:cf:f6:7e 
Mon Apr 24 17:26:09 2017 daemon.info dnsmasq-dhcp[1972]: DHCPACK(br-lan) 192.168.2.225 48:59:29:cf:f6:7e LG-L90_Adrian
Mon Apr 24 17:26:10 2017 daemon.info odhcpd[1034]: Using a RA lifetime of 0 seconds on br-lan
Mon Apr 24 17:26:13 2017 daemon.info dnsmasq-dhcp[1972]: DHCPINFORM(br-lan) 192.168.2.176 b8:70:f4:52:0a:65 
Mon Apr 24 17:26:13 2017 daemon.info dnsmasq-dhcp[1972]: DHCPACK(br-lan) 192.168.2.176 b8:70:f4:52:0a:65 TOSHIBA-NB550D_Ethernet