RT-AC86U Watchdog

Current firmware 3.0.0.4.384_82072
I have an 86U router - ethernet backhaul - 86U AiMesh.
Can anyone please tell me if this is normal? My System Log is a constant stream of 'watchdog stuff'.

Sep 1 04:40:34 rc_service: skip the event: restart_watchdog.
Sep 1 04:41:19 check_watchdog: [check_watchdog] restart watchdog for no heartbeat
Sep 1 04:41:19 rc_service: check_watchdog 1302:notify_rc restart_watchdog
Sep 1 04:41:19 rc_service: waitting "restart_sendfeedback" via cfg_server ...
Sep...

RT-AC86U Watchdog