I shutdown the Pi running raspberian 64 lite with
poweroff many times before and restarted it by un- and replugging without problems. After following this https://www.youtube.com/watch?v=RMW1Zi8MSas
tutorial, after restart, it does not connect to the router anymore, only after rewriting the OS image to the disk. Could it have something to do with the edits made? These are creating a directory
and inserting a line in fstab
/dev/partitionname ext4 defaults,uid=1000,guid=1000,dmask=002,fmask=113,rw 0 0
Restarting the router does not help...