Just looked into the Event Viewer...
At round 1.08.00 am I have "a request to disable windows desktop manager" followed by "faulty application name cgminer.exe..module amdocl.dll" and to top things off "amdkmdap driver crashed and successfully recovered" 1 sec after that...few hours later fragmentation process starts, finishes and the pc "shuts down ". Have in mind cards fans were working...Anyone

EDIT: One worker stopped soon after the upper mentioned findings the other 3 hours after that..
Sorry for the late reply, been away for the day...
It seems like the drivers are crashing which is causing cgminer to crash as well... When this happens and you're infront of the PC you'll notice the screens will turn off then back on and a bubble will pop out saying that the driver has crashed and recovered.
If you're not on version 13.3, update to that version it's more stable, check the OC if you're OCing the card, keep in mind that for scrypt mining the best ratio should be 0.68 e.g: CPU 1000 mem 1,470 if you're OCing the card unofficially through MSIAfterburner.conf, don't add the line manually, it cause my card to crash, just replace the 0 with 1 next to unofficialunlock= 0; this will give you a warning the1st time you launch afterburner, then it will fix itself.
Other things to look at is the intensity and the thread concurrency, lowering them will give you a more stable yet a bit slower mining.
Hope this helps