My openwrt is broken?

hi, i have linksys EA8300, and i use for connect on my neighbor on public Wifi ( public but whit login and normaly 2 houres continuous session ) and since 2016 ( before EA8300, i have tplink904nd v3 )

on the week, i would like try to another service ( USB key SMB support ), me fail install and restore sysupgrade and upgrade version.

BUT now i have a problem whit my "ISP" my lease time ( i don't know since yesterday my ISP have lease ) is 1200 sc. and for re-new IP is very long time disconnected.

i have looked on forum, and have 2 solutions, ( i don't know if another solution exist )

1/ attribute ip static on WWAN, but before, no problem for me whit dynamic ip
2/ try to force change lease time
3/ downgrade version openwrt but i don't know my good version.....

i post little syslog on night yesterday :

un Jul  4 22:43:12 2021 authpriv.info dropbear[7704]: Exit (root): Keepalive timeout
Sun Jul  4 22:49:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Sun Jul  4 22:49:09 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Sun Jul  4 22:59:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Sun Jul  4 22:59:09 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Sun Jul  4 23:09:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Sun Jul  4 23:09:09 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Sun Jul  4 23:19:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Sun Jul  4 23:19:09 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Sun Jul  4 23:29:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Sun Jul  4 23:29:09 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Sun Jul  4 23:39:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Sun Jul  4 23:39:09 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Sun Jul  4 23:41:22 2021 daemon.notice hostapd: wlan1-1: AP-STA-DISCONNECTED d8:be:65:8d:d9:a1
Sun Jul  4 23:41:22 2021 daemon.info hostapd: wlan1-1: STA d8:be:65:8d:d9:a1 IEEE 802.11: disassociated due to inactivity
Sun Jul  4 23:41:23 2021 daemon.info hostapd: wlan1-1: STA d8:be:65:8d:d9:a1 IEEE 802.11: deauthenticated due to inactivity (timer DEAUTH/REMOVE)
Sun Jul  4 23:41:28 2021 daemon.notice hostapd: wlan1-1: AP-STA-DISCONNECTED 78:bd:bc:70:99:72
Sun Jul  4 23:41:28 2021 daemon.info hostapd: wlan1-1: STA 78:bd:bc:70:99:72 IEEE 802.11: disassociated due to inactivity
Sun Jul  4 23:41:29 2021 daemon.info hostapd: wlan1-1: STA 78:bd:bc:70:99:72 IEEE 802.11: deauthenticated due to inactivity (timer DEAUTH/REMOVE)
Sun Jul  4 23:49:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Sun Jul  4 23:49:09 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Sun Jul  4 23:59:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Sun Jul  4 23:59:09 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 00:09:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 00:09:09 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 00:19:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 00:19:09 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 00:29:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 00:29:09 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 00:39:09 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 00:39:10 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 00:49:10 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 00:49:10 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 00:59:10 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 01:04:10 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 01:06:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 01:06:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 01:16:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 01:16:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 01:26:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 01:26:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 01:36:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 01:36:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 01:46:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 01:46:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 01:56:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 01:56:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 02:06:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 02:06:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 02:16:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 02:21:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 02:21:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 02:31:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 02:31:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 02:41:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 02:41:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 02:51:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 02:51:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 03:01:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 03:03:11 2021 kern.warn kernel: [19552.808730] ath10k_ahb a800000.wifi: Invalid VHT mcs 15 peer stats
Mon Jul  5 03:06:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 03:09:10 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 03:09:10 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 03:19:10 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 03:24:10 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 03:26:40 2021 daemon.notice netifd: wwan (7404): udhcpc: sending renew to 192.168.2.1
Mon Jul  5 03:26:40 2021 daemon.notice netifd: wwan (7404): udhcpc: lease of 192.168.2.92 obtained, lease time 1200
Mon Jul  5 03:35:29 2021 daemon.info hostapd: wlan1-1: STA 6c:71:d9:ac:18:1d IEEE 802.11: authenticated
Mon Jul  5 03:35:29 2021 daemon.info hostapd: wlan1-1: STA 6c:71:d9:ac:18:1d IEEE 802.11: associated (aid 2)
Mon Jul  5 03:35:29 2021 daemon.notice hostapd: wlan1-1: AP-STA-CONNECTED 6c:71:d9:ac:18:1d
Mon Jul  5 03:35:29 2021 daemon.info hostapd: wlan1-1: STA 6c:71:d9:ac:18:1d WPA: pairwise key handshake completed (RSN)
Mon Jul  5 03:35:29 2021 daemon.info dnsmasq-dhcp[5059]: DHCPREQUEST(br-lan) 10.0.0.10 6c:71:d9:ac:18:1d
Mon Jul  5 03:35:29 2021 daemon.info dnsmasq-dhcp[5059]: DHCPACK(br-lan) 10.0.0.10 6c:71:d9:ac:18:1d ASUS_N76
Mon Jul  5 03:35:35 2021 authpriv.info dropbear[16902]: Child connection from 10.0.0.10:25522
Mon Jul  5 03:35:36 2021 authpriv.notice dropbear[16902]: Password auth succeeded for 'root' from 10.0.0.10:25522
Mon Jul  5 03:35:47 2021 daemon.err uhttpd[988]: luci: accepted login on /admin/status/syslog for root from 10.0.0.10

udhcpc is new service on openwrt , or update recently ? i don't kwon if him the problem... dhcpcd is same ?

i try again modify firmware installed app :

change :

ath10k-firmware-qca4019-ct - 2019-10-03-d622d160-1 for ath10k-firmware-qca4019 20190416-1
ath10k-firmware-qca9888-ct - 2019-10-03-d622d160-1 for ath10k-firmware-qca9888 20190416-1

on config/DHCP, add 2 last lines :

config dhcp 'wan'
	option interface 'wan'
	option ignore '1'
	option ra_useleasetime '999999'
	option leasetime '12h'

and in /etc/config/wireless add option disassoc_low_ack '0'

all not work, but i'am begginer and think i don't know really me realisate.

is possible help me, i reply to you on 10 houre because i'm work today

for the entire syslog and kernel log :

syslog : https://pastebin.com/65mUU2Wt
kernel log : https://pastebin.com/TtmzJaQh

thank you