I discovered that vol+power solution while suffering another major bug. Has it accoured to anyone that sfosx behaves crazy if too many access points are around?

Behaviour was same as taixzo and lkravovicz desribed, but in a continous row.
Everytime i hard rebooted, it locked up again 2 minutes later.
Happend both at Hannover Tradefair and automatica in munich.

Only solution was to turn of wlan.
My tip is some aggressive captive portals sfos happily connects too or something.