I have problem with my C2600 and Xbox One S , I want to use 5ghz wifi to connect but i can not, when I disable wmm it connects but speed become very low. There is no problem with 2.4Ghz. Log below, i deleted mac ID of xbox. Other devices can connect 5ghz wifi without a problem.
Sun Feb 2 18:51:36 2020 daemon.notice hostapd: wlan1: AP-STA-CONNECTED
Sun Feb 2 18:51:36 2020 daemon.info hostapd: wlan1: STA WPA: pairwise key handshake completed (RSN)
Sun Feb 2 18:51:36 2020 daemon.info dnsmasq-dhcp[2156]: DHCPDISCOVER(br-lan)
Sun Feb 2 18:51:36 2020 daemon.info dnsmasq-dhcp[2156]: DHCPOFFER(br-lan) 192.168.1.124
Sun Feb 2 18:51:36 2020 daemon.info dnsmasq-dhcp[2156]: DHCPREQUEST(br-lan) 192.168.1.124
Sun Feb 2 18:51:36 2020 daemon.info dnsmasq-dhcp[2156]: DHCPACK(br-lan) 192.168.1.124 XBOXONE
Sun Feb 2 18:51:38 2020 daemon.info dnsmasq[2156]: read /etc/hosts - 4 addresses
Sun Feb 2 18:51:38 2020 daemon.info dnsmasq[2156]: read /tmp/hosts/odhcpd - 2 addresses
Sun Feb 2 18:51:38 2020 daemon.info dnsmasq[2156]: read /tmp/hosts/dhcp.cfg01411c - 3 addresses
Sun Feb 2 18:51:38 2020 daemon.info dnsmasq-dhcp[2156]: read /etc/ethers - 0 addresses
Sun Feb 2 18:52:50 2020 daemon.notice hostapd: wlan1: AP-STA-DISCONNECTED
Sun Feb 2 18:52:50 2020 daemon.info hostapd: wlan1: STA IEEE 802.11: disassociated
Sun Feb 2 18:52:54 2020 daemon.info hostapd: wlan0: STA IEEE 802.11: authenticated
Sun Feb 2 18:52:54 2020 daemon.info hostapd: wlan0: STA IEEE 802.11: associated (aid 1)
Sun Feb 2 18:52:54 2020 daemon.notice hostapd: wlan0: AP-STA-CONNECTED
Sun Feb 2 18:52:54 2020 daemon.info hostapd: wlan0: STA WPA: pairwise key handshake completed (RSN)
Sun Feb 2 18:52:54 2020 daemon.info dnsmasq-dhcp[2156]: DHCPDISCOVER(br-lan)
Sun Feb 2 18:52:54 2020 daemon.info dnsmasq-dhcp[2156]: DHCPOFFER(br-lan) 192.168.1.124
Sun Feb 2 18:52:54 2020 daemon.info dnsmasq[2156]: read /etc/hosts - 4 addresses
Sun Feb 2 18:52:54 2020 daemon.info dnsmasq[2156]: read /tmp/hosts/odhcpd - 1 addresses
Sun Feb 2 18:52:54 2020 daemon.info dnsmasq[2156]: read /tmp/hosts/dhcp.cfg01411c - 3 addresses
Sun Feb 2 18:52:54 2020 daemon.info dnsmasq-dhcp[2156]: read /etc/ethers - 0 addresses
Sun Feb 2 18:52:54 2020 daemon.info dnsmasq-dhcp[2156]: DHCPDISCOVER(br-lan)
Sun Feb 2 18:52:54 2020 daemon.info dnsmasq-dhcp[2156]: DHCPOFFER(br-lan) 192.168.1.124
Sun Feb 2 18:52:54 2020 daemon.info dnsmasq-dhcp[2156]: DHCPREQUEST(br-lan) 192.168.1.124
Sun Feb 2 18:52:54 2020 daemon.info dnsmasq-dhcp[2156]: DHCPACK(br-lan) 192.168.1.124 XBOXONE
Sun Feb 2 18:52:55 2020 daemon.info dnsmasq[2156]: read /etc/hosts - 4 addresses
Sun Feb 2 18:52:55 2020 daemon.info dnsmasq[2156]: read /tmp/hosts/odhcpd - 2 addresses
Sun Feb 2 18:52:55 2020 daemon.info dnsmasq[2156]: read /tmp/hosts/dhcp.cfg01411c - 3 addresses
Sun Feb 2 18:52:55 2020 daemon.info dnsmasq-dhcp[2156]: read /etc/ethers - 0 addresses