@stephenw10 I'll have to re-enable writing system logs to disk. I had read that log rotation could cause some restarted services, so I turned it off to rule it out, and because it's better for the SSD.
The fact is, I looked though all the logs when I was keeping them, but never saw anything that gave me, of limited knowledge, a clue that something was wrong. For example, there wouldn't even be any entries anywhere during the few minutes it was down, or right before/after. Like it had nothing going on. On the dashboard widget I do notice, if it's open at the time, that my states jump up when it's happening and then drop slowly back down. But if the dashboard isn't open I can't even get to the GUI. It's very unresponsive (GUI) when the system hangs. The dashboard will even time out if I'm already in...
It's as though the whole system hangs, and the states reload. Even though no feed updates or anything are occurring.
And the firewall doesn't stop passing traffic. If I'm streaming something from my media server, for example, playback continues uninterrupted. But if I exit the stream and go back to the server, things won't load or update. So I can't play something new. Like the states aren't there and new connections aren't happening, or happening really slow.