Hmmmm, interesting, thanks for the links.
I checked my system logs and didn't see anything around:
IEEE 802.11: deauthenticated due to inactivity (timer DEA
UTH/REMOVE)
or
IEEE 802.11: disconnected due to excessive missing ACKs
I think that matches the issue you describe in your post:
There is a third issue with Android that I have experienced where all the issues above are resolved with the work-arounds as noted I still experience an issue where I cannot access the Internet. Android says I am connected. OpenWRT log says I am connected but I cannot access any site on the Internet. If I leave it alone it will resolve itself after some minutes. I am impatient so I turn off then on the Android wireless and all is good (reestablish the connection). I also have hostapd loglevel set to 1 and I do not see anything in the log either.
I'll SSH into my router and do a logread as soon as it happens next time.
Edit - If it keeps happening, I might take a stab at rebuilding with this patch added to see if it indeed fixes things:
https://patchwork.ozlabs.org/project/openwrt/patch/20210722165406.1708-1-arinc.unal@gmail.com/
Edit 2 - Happened again this morning. Here's a copy of the syslog during the time of the event. Nothing really jumps out at me aside from the pattern of connect/disconnect er, actually, I do see deauthenticated due to inactivity (timer DEAUTH/REMOVE) in there:
Wed Aug 11 16:14:54 2021 daemon.info hostapd: wlan1: STA a8:10:87:6e:c1:33 IEEE 802.11: associated (aid 2)
Wed Aug 11 16:14:54 2021 daemon.notice hostapd: wlan1: AP-STA-CONNECTED a8:10:87:6e:c1:33
Wed Aug 11 16:14:54 2021 daemon.info hostapd: wlan1: STA a8:10:87:6e:c1:33 RADIUS: starting accounting session E833591220E090E1
Wed Aug 11 16:14:54 2021 daemon.info hostapd: wlan1: STA a8:10:87:6e:c1:33 WPA: pairwise key handshake completed (RSN)
Wed Aug 11 16:14:54 2021 daemon.notice hostapd: wlan1: EAPOL-4WAY-HS-COMPLETED a8:10:87:6e:c1:33
Wed Aug 11 16:14:54 2021 daemon.info dnsmasq-dhcp[1]: DHCPDISCOVER(br-lan) a8:10:87:6e:c1:33
Wed Aug 11 16:14:54 2021 daemon.info dnsmasq-dhcp[1]: DHCPOFFER(br-lan) 192.168.1.127 a8:10:87:6e:c1:33
Wed Aug 11 16:14:54 2021 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.1.127 a8:10:87:6e:c1:33
Wed Aug 11 16:14:54 2021 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.1.127 a8:10:87:6e:c1:33
Wed Aug 11 16:14:55 2021 daemon.info hostapd: wlan1: STA a8:10:87:6e:c1:33 IEEE 802.11: authenticated
Wed Aug 11 16:14:59 2021 daemon.notice hostapd: wlan1: AP-STA-DISCONNECTED a8:10:87:6e:c1:33
Wed Aug 11 16:14:59 2021 kern.debug kernel: [338779.308934] ieee80211 phy1: staid 2 deleted
Wed Aug 11 16:15:40 2021 daemon.notice hostapd: wlan0: AP-STA-DISCONNECTED 9a:3e:94:9f:f1:4c
Wed Aug 11 16:15:40 2021 daemon.info hostapd: wlan0: STA 9a:3e:94:9f:f1:4c IEEE 802.11: disassociated
Wed Aug 11 16:15:40 2021 kern.debug kernel: [338820.070172] ieee80211 phy0: staid 1 deleted
Wed Aug 11 16:15:41 2021 daemon.info hostapd: wlan0: STA 9a:3e:94:9f:f1:4c IEEE 802.11: deauthenticated due to inactivity (timer DEAUTH/REMOVE)
Wed Aug 11 16:15:44 2021 daemon.info hostapd: wlan0: STA 9a:3e:94:9f:f1:4c IEEE 802.11: associated (aid 1)
Wed Aug 11 16:15:44 2021 daemon.info hostapd: wlan0: STA 9a:3e:94:9f:f1:4c IEEE 802.11: authenticated
Wed Aug 11 16:15:44 2021 daemon.notice hostapd: wlan0: AP-STA-CONNECTED 9a:3e:94:9f:f1:4c
Wed Aug 11 16:15:44 2021 daemon.info hostapd: wlan0: STA 9a:3e:94:9f:f1:4c RADIUS: starting accounting session 50741EF98FC07017
Wed Aug 11 16:15:44 2021 daemon.info hostapd: wlan0: STA 9a:3e:94:9f:f1:4c WPA: pairwise key handshake completed (RSN)
Wed Aug 11 16:15:44 2021 daemon.notice hostapd: wlan0: EAPOL-4WAY-HS-COMPLETED 9a:3e:94:9f:f1:4c
Wed Aug 11 16:15:44 2021 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.1.248 9a:3e:94:9f:f1:4c
Wed Aug 11 16:15:44 2021 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.1.248 9a:3e:94:9f:f1:4c Adubs-iPhone
Wed Aug 11 16:15:54 2021 daemon.info hostapd: wlan1: STA a8:10:87:6e:c1:33 IEEE 802.11: associated (aid 2)
Wed Aug 11 16:15:54 2021 daemon.notice hostapd: wlan1: AP-STA-CONNECTED a8:10:87:6e:c1:33
Wed Aug 11 16:15:54 2021 daemon.info hostapd: wlan1: STA a8:10:87:6e:c1:33 RADIUS: starting accounting session 604A206CEB22D45C
Wed Aug 11 16:15:54 2021 daemon.info hostapd: wlan1: STA a8:10:87:6e:c1:33 WPA: pairwise key handshake completed (RSN)
Wed Aug 11 16:15:54 2021 daemon.notice hostapd: wlan1: EAPOL-4WAY-HS-COMPLETED a8:10:87:6e:c1:33
Wed Aug 11 16:15:54 2021 daemon.info dnsmasq-dhcp[1]: DHCPDISCOVER(br-lan) a8:10:87:6e:c1:33
Wed Aug 11 16:15:54 2021 daemon.info dnsmasq-dhcp[1]: DHCPOFFER(br-lan) 192.168.1.127 a8:10:87:6e:c1:33
Wed Aug 11 16:15:54 2021 daemon.info dnsmasq-dhcp[1]: DHCPREQUEST(br-lan) 192.168.1.127 a8:10:87:6e:c1:33
Wed Aug 11 16:15:54 2021 daemon.info dnsmasq-dhcp[1]: DHCPACK(br-lan) 192.168.1.127 a8:10:87:6e:c1:33
Wed Aug 11 16:15:54 2021 daemon.info hostapd: wlan1: STA a8:10:87:6e:c1:33 IEEE 802.11: authenticated
Wed Aug 11 16:15:59 2021 daemon.notice hostapd: wlan1: AP-STA-DISCONNECTED a8:10:87:6e:c1:33
Wed Aug 11 16:15:59 2021 kern.debug kernel: [338839.451147] ieee80211 phy1: staid 2 deleted