ED: this problem only happens now when I play blizzard games , hearthstone , heroes of the storm ,etc.
It's happening to many people and there's no set answer to the problem :https://www.reddit.com/r/hearthstone/comments/4h9fdy/psa_battlenethearthstone_causing_random_amd_gpu/
I clean installed drivers and put 16.9.2 yesterday which seemed to work but today I tried with hearthstone on high graphics and it crashed. On medium again and it crashed.
It's a random error , sometimes I can play for +1 hour before it happens or sometimes it happens right after 1 crash.
Tested with other hig end games which should consume way more than hearthstone and they didndt break anything