I'm running a headless Pi2. Since a week or two the Pi keeps crashing, that is, there is no way of ssh'ing into it anymore. I have to unplug the power, leave it be for a bit, plug it in and then it's good to go... until the next crash. I suspect there is something going on with some systemd services I have to start radarr, sonarr, bazarr and nzbget. I've got those services setup and then some timer services to start and kill those services for when my NAS is down.
Did a systemd update change something in the way timers work? Or is there something else going on? Any suggestions on how to troubleshoot this are welcome. For now I have disabled the timers and that seems to bring back stability.