I wish I had more to go on. I pulled the latest image, and checked all the configurations, but nothing changed that I know of to trigger the break. It was working, then it stopped. I can't connect to the web interface over LAN or WAN.
I notice that your Pi-hole is receiving DNS requests from 192.168.86.1.
If that is your router, then you may have configured your router to use Pi-hole as ist upstream. While a valid configuration, you may have to lift Pi-hole's DNS query rate limiting, as your router would aggregate your entire network's DNS traffic and send it to Pi-hole..
The rate limit may only be triggered occassionally, during high levels of DNS activity. Also, a rate limit expire after a while, once the level drops to lower levels again.
(In virtualised environments like Docker, the information from the debug log is less conclusive than for bare metal. We can still infer that DNS is working by assessing other relevant parts of the log.)