It has happened since (haven't pulled the logs yet), but I'm inclined to think you're right it's an OS error or hardware issue. There are various other odd things which happen to this server (random significant drop in network performance, display not kicking on, etc.).

Thanks for the quick response!

1. What did you do: While playing (on my laptop) a game hosted on my server (ubuntu 20.04) located in my local network. 2. What happened? the game reported "server not responding". While this was happening I pinged the server and I was able to access it just fine (~50ms ping). Reviewing sy...