Sorry for lacking the response. I lost track of this report somehow.. Well, some time has gone by since my last report... I upgraded to 13.2 in 11/14, and that cured the most offensive behaviour. Meanwhile, it's up to 4.2.5, and that even performs a proper shutdown with non responding (systemd automounted) nfs mounts correctly (wlan ap switches wlan off during deep night..), given the user is patient enough. Sorry. Solved.