I can't even do that for my own homelab. If restarting everything in order from most to least likely culprit doesn't make it work again I'm usually fucked and looking forward to a couple hours of work.

Example: My "Smart" TV must have something like this in its code:

void main() {
    if(hasLocalIP && !hasInternetAccess) {
        randomlyQuitJellyfinEvery20MinutesOrSo = true;
    }
    startTV();
}

This took 2 weeks of restarting, app reinstalling, factory resetting, OS updating, OS downgrading, OS updating but different method, etc. to figure out. I'm literally just unplugging its ethernet port before starting now, it's that simple. I've never allowed it to connect to the internet though - no ad revenue for you, Google!