I refuse to accept that. This all started after a Freenas update without anything else changing as far as I remember. That advice to start over is like telling someone to re-install his Windows machine when he's experiencing a problem.
Thats advice I've seen given out a lot on this forum rather than getting some pointers towards where to find log files to fix the cause of the problem.
@SweetAndLow: that's not meant personally towards you, it just reflects my opinion as of lately.
As it seems unlikely to get any helpful advice on how to find the root cause of the problem, lets just agree to close this thread here. I've been given workarounds that will keep the system working for a while and that's good enough for now.