Well, besides the obvious like unplug the netwerk cable or switch it out, there could be a bad connector etc. Also unplugging and powering down are two different things. I’m pretty dumb but maybe there could possibly be enough power to keep the settings, ie:standby power? Perhaps? I would still unplug for 5-10 minutes just to be double sure and while you’re at it swap your netwerk cable out or at least check the fittings/connectors. Good luck!!