It looks like it is indeed a power management issue. Last threee days I made 
and manually run this script when I login;
seba@D630:~$ cat $HOME/bin/iwl_power_save.sh 
sudo iw dev wlp12s0 get power_save
sudo iw dev wlp12s0 set power_save off
sudo iw dev wlp12s0 get power_save

and I haven't had any issue.
Everytime I boot power management is on and I switch it off.
I will report in a week. Maybe I will also switch back to the HWE kernel to 
make sure this is reproducible with the ubuntu kernel.

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https://bugs.launchpad.net/bugs/1627828

Title:
  iwl3945 crashes randomly

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