Sounds like a bad overclock to me. First step, I would take is to make sure the system files are ok with sfc command:
I would also comb through the event log for the system looking for potential errors of what is going wrong like HD having issues or something else.
If all that looks good, I would get a system stress app like RealBench and see if it passes that.
my Sapphire Radeon HD 7870 is truly the OC version but I've never overclocked it manually. As a matter of fact I've even downclocked it to its original non-OC stats due to troubles with GTA 5.
sfc tells me that everything's fine as it is
Try to disable hardware acceleration in Chrome.
Hanging Radeon Software point on some type of corruption in your system.
Try to clean your system (DDU program) or restore your win10 (Open Start > Settings > Update & Security to begin, selecting Recovery in the left-hand menu. Under Reset this PC, click or tap Get Started) But be careful and save your important data before reset your system.
My system was running now for about a week straight and non-stop without any crashes or freezes. I didn't do any changes. No idea... Btw, my system is pretty fresh and I do like to keep it tidy, updated and safe
Anyways, just booted in Safe-Mode, ran DDU, installed 16.11.4 hotfix and voila - like expected - after another driver update the crimson software fixed itself
I guess the problem is solved. If not, I'll report again.
Thanks to all who tried giving advice!