Ubuntu 16.04 randmoly freezes

Hi, I am ruing a fresh install of `Ubuntu 16.04` on my `Toshiba Satellite L50`. Fairly often (once per hour or so) it randomly freezes. The system is installed in UEFI mode, although it had the same problem during a test install in Legacy.
I've tried the following:
- Updating keel to `4.6.2`
- Installing Nvidia prime
- Trying to enter shell by pressing `ctrl + alt +f3` (alteatively `ctrl + alt+ f1`)

I've been searching for a solution for a long time now, with no result. Can somebody help?

This (http://pastebin.com/sfND0UNG) a copy of syslog, the freeze happened aproximately at 22:00