I have an Asus RT-AX86S running 388.2_2 that briefly (1-2 minutes duration) drops connection quite regularly, might be every day. If i'm honest i don't think it's related to the firmware and i suspect it's a configuration issue (i.e. my fault).
Here's what going on in the log (I have noticed that the time was set incorrectly - it was an hour out - i've rectified that now):
May 10 08:48:11 ntpd: Initial clock set
May 10 08:48:11 miniupnpd[1954]: HTTP listening on port 58653
May 10 08:48:11 miniupnpd[1954]: Listening for NAT-PMP/PCP traffic on port 5351
May 10 08:48:11 rc_service: udhcpc_wan 1778:notify_rc stop_samba
May 10 08:48:11 rc_service: udhcpc_wan 1778:notify_rc start_samba
May 10 08:48:11 rc_service: waitting "stop_samba" via udhcpc_wan ...
May 10 08:48:11 rc_service: ntpd_synced 1952:notify_rc restart_diskmon
May 10 08:48:11 rc_service: waitting "stop_samba" via udhcpc_wan ...
May 10 08:48:11 Samba_Server: smb daemon is stopped
May 10 08:48:12 rc_service: udhcpc_wan 1778:notify_rc stop_samba
May 10 08:48:12 rc_service: waitting "start_samba" via udhcpc_wan ...
May 10 08:48:12 dnsmasq[1514]: exiting on receipt of SIGTERM
May 10 08:48:12 dnsmasq[1963]: started, version 2.89 cachesize 1500
May 10 08:48:12 dnsmasq[1963]: asynchronous logging enabled, queue limit is 5 messages
May 10 08:48:12 dnsmasq-dhcp[1963]: DHCP, IP range 192.168.102.2 -- 192.168.102.254, lease time 1d
May 10 08:48:12 dnsmasq-dhcp[1963]: DHCP, IP range 192.168.101.2 -- 192.168.101.254, lease time 1d
May 10 08:48:12 dnsmasq-dhcp[1963]: DHCP, IP range 192.168.1.10 -- 192.168.1.254, lease time 1d
May 10 08:48:12 dnsmasq[1963]: read /etc/hosts - 22 names
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.133#53
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.134#53
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.133#53 for domain local
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.134#53 for domain local
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.133#53
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.134#53
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.133#53 for domain local
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.134#53 for domain local
May 10 08:48:13 kernel: cfg80211: Calling CRDA to update world regulatory domain
May 10 08:48:13 rc_service: udhcpc_wan 1778:notify_rc start_samba
May 10 08:48:13 rc_service: waitting "stop_samba" via udhcpc_wan ...
May 10 08:48:13 Samba_Server: smb daemon is stopped
May 10 08:48:14 dhcp_client: bound 10.46.218.201/255.255.255.254 via 10.46.218.200 for 864000 seconds.
May 10 08:48:14 dnsmasq[1963]: exiting on receipt of SIGTERM
May 10 08:48:14 dnsmasq[1978]: started, version 2.89 cachesize 1500
May 10 08:48:14 dnsmasq[1978]: asynchronous logging enabled, queue limit is 5 messages
May 10 08:48:14 dnsmasq-dhcp[1978]: DHCP, IP range 192.168.102.2 -- 192.168.102.254, lease time 1d
May 10 08:48:14 dnsmasq-dhcp[1978]: DHCP, IP range 192.168.101.2 -- 192.168.101.254, lease time 1d
May 10 08:48:14 dnsmasq-dhcp[1978]: DHCP, IP range 192.168.1.10 -- 192.168.1.254, lease time 1d
May 10 08:48:14 dnsmasq[1978]: read /etc/hosts - 22 names
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.133#53
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.134#53
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.133#53 for domain local
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.134#53 for domain local
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.133#53
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.134#53
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.133#53 for domain local
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.134#53 for domain local
May 10 08:48:15 disk_monitor: Finish
May 10 08:48:15 disk_monitor: be idle
May 10 08:48:16 kernel: cfg80211: Exceeded CRDA call max attempts. Not calling CRDA
May 10 08:48:42 crond[1522]: time disparity of 2636863 minutes detected
May 10 08:49:15 wlceventd: wlceventd_proc_event(530): eth6: Auth 54:2A:1B:FC:42:C6, status: Successful (0), rssi:-55
May 10 08:49:15 wlceventd: wlceventd_proc_event(559): eth6: Assoc 54:2A:1B:FC:42:C6, status: Successful (0), rssi:-55
May 10 08:49:15 hostapd: eth6: STA 54:2a:1b:fc:42:c6 IEEE 802.11: associated
May 10 08:49:15 hostapd: eth6: STA 54:2a:1b:fc:42:c6 RADIUS: starting accounting session 290487C7D721BCF0
May 10 08:49:15 hostapd: eth6: STA 54:2a:1b:fc:42:c6 WPA: pairwise key handshake completed (RSN)
May 10 08:49:19 wlceventd: wlceventd_proc_event(530): eth6: Auth 00:0E:58:C4:57:92, status: Successful (0), rssi:-86
May 10 08:49:19 hostapd: eth6: STA 00:0e:58:c4:57:92 IEEE 802.11: associated
May 10 08:49:19 wlceventd: wlceventd_proc_event(559): eth6: Assoc 00:0E:58:C4:57:92, status: Successful (0), rssi:-86
May 10 08:49:19 hostapd: eth6: STA 00:0e:58:c4:57:92 RADIUS: starting accounting session 43859A951739F4A1
May 10 08:49:19 hostapd: eth6: STA 00:0e:58:c4:57:92 WPA: pairwise key handshake completed (RSN)
Here's what going on in the log (I have noticed that the time was set incorrectly - it was an hour out - i've rectified that now):
May 10 08:48:11 ntpd: Initial clock set
May 10 08:48:11 miniupnpd[1954]: HTTP listening on port 58653
May 10 08:48:11 miniupnpd[1954]: Listening for NAT-PMP/PCP traffic on port 5351
May 10 08:48:11 rc_service: udhcpc_wan 1778:notify_rc stop_samba
May 10 08:48:11 rc_service: udhcpc_wan 1778:notify_rc start_samba
May 10 08:48:11 rc_service: waitting "stop_samba" via udhcpc_wan ...
May 10 08:48:11 rc_service: ntpd_synced 1952:notify_rc restart_diskmon
May 10 08:48:11 rc_service: waitting "stop_samba" via udhcpc_wan ...
May 10 08:48:11 Samba_Server: smb daemon is stopped
May 10 08:48:12 rc_service: udhcpc_wan 1778:notify_rc stop_samba
May 10 08:48:12 rc_service: waitting "start_samba" via udhcpc_wan ...
May 10 08:48:12 dnsmasq[1514]: exiting on receipt of SIGTERM
May 10 08:48:12 dnsmasq[1963]: started, version 2.89 cachesize 1500
May 10 08:48:12 dnsmasq[1963]: asynchronous logging enabled, queue limit is 5 messages
May 10 08:48:12 dnsmasq-dhcp[1963]: DHCP, IP range 192.168.102.2 -- 192.168.102.254, lease time 1d
May 10 08:48:12 dnsmasq-dhcp[1963]: DHCP, IP range 192.168.101.2 -- 192.168.101.254, lease time 1d
May 10 08:48:12 dnsmasq-dhcp[1963]: DHCP, IP range 192.168.1.10 -- 192.168.1.254, lease time 1d
May 10 08:48:12 dnsmasq[1963]: read /etc/hosts - 22 names
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.133#53
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.134#53
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.133#53 for domain local
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.134#53 for domain local
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.133#53
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.134#53
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.133#53 for domain local
May 10 08:48:12 dnsmasq[1963]: using nameserver 109.249.185.134#53 for domain local
May 10 08:48:13 kernel: cfg80211: Calling CRDA to update world regulatory domain
May 10 08:48:13 rc_service: udhcpc_wan 1778:notify_rc start_samba
May 10 08:48:13 rc_service: waitting "stop_samba" via udhcpc_wan ...
May 10 08:48:13 Samba_Server: smb daemon is stopped
May 10 08:48:14 dhcp_client: bound 10.46.218.201/255.255.255.254 via 10.46.218.200 for 864000 seconds.
May 10 08:48:14 dnsmasq[1963]: exiting on receipt of SIGTERM
May 10 08:48:14 dnsmasq[1978]: started, version 2.89 cachesize 1500
May 10 08:48:14 dnsmasq[1978]: asynchronous logging enabled, queue limit is 5 messages
May 10 08:48:14 dnsmasq-dhcp[1978]: DHCP, IP range 192.168.102.2 -- 192.168.102.254, lease time 1d
May 10 08:48:14 dnsmasq-dhcp[1978]: DHCP, IP range 192.168.101.2 -- 192.168.101.254, lease time 1d
May 10 08:48:14 dnsmasq-dhcp[1978]: DHCP, IP range 192.168.1.10 -- 192.168.1.254, lease time 1d
May 10 08:48:14 dnsmasq[1978]: read /etc/hosts - 22 names
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.133#53
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.134#53
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.133#53 for domain local
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.134#53 for domain local
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.133#53
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.134#53
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.133#53 for domain local
May 10 08:48:14 dnsmasq[1978]: using nameserver 109.249.185.134#53 for domain local
May 10 08:48:15 disk_monitor: Finish
May 10 08:48:15 disk_monitor: be idle
May 10 08:48:16 kernel: cfg80211: Exceeded CRDA call max attempts. Not calling CRDA
May 10 08:48:42 crond[1522]: time disparity of 2636863 minutes detected
May 10 08:49:15 wlceventd: wlceventd_proc_event(530): eth6: Auth 54:2A:1B:FC:42:C6, status: Successful (0), rssi:-55
May 10 08:49:15 wlceventd: wlceventd_proc_event(559): eth6: Assoc 54:2A:1B:FC:42:C6, status: Successful (0), rssi:-55
May 10 08:49:15 hostapd: eth6: STA 54:2a:1b:fc:42:c6 IEEE 802.11: associated
May 10 08:49:15 hostapd: eth6: STA 54:2a:1b:fc:42:c6 RADIUS: starting accounting session 290487C7D721BCF0
May 10 08:49:15 hostapd: eth6: STA 54:2a:1b:fc:42:c6 WPA: pairwise key handshake completed (RSN)
May 10 08:49:19 wlceventd: wlceventd_proc_event(530): eth6: Auth 00:0E:58:C4:57:92, status: Successful (0), rssi:-86
May 10 08:49:19 hostapd: eth6: STA 00:0e:58:c4:57:92 IEEE 802.11: associated
May 10 08:49:19 wlceventd: wlceventd_proc_event(559): eth6: Assoc 00:0E:58:C4:57:92, status: Successful (0), rssi:-86
May 10 08:49:19 hostapd: eth6: STA 00:0e:58:c4:57:92 RADIUS: starting accounting session 43859A951739F4A1
May 10 08:49:19 hostapd: eth6: STA 00:0e:58:c4:57:92 WPA: pairwise key handshake completed (RSN)