I think it's part of the system that's getting overly excited. I keep having to re-enter my pin for the phone as if it's restarted, but not for my SIM. I'm guessing some process that keeps track of the authentication starts eating battery and is restarted. That would fit with it not always being warm and draining the battery, but I don't know what triggers it several times a day.
In a decentralised social media it makes sense to host yourself. That's what we decided to do. This instance is run by two nerds, mostly for the why not of it. Feel free to join, and we'll hit you up with an "Hi, who are you?".