It has been a while since I had a Radeon graphics, but my gues is that the ReLive broadcasting features may be doing something to make your PC unhappy.
Try removing all ReLive stuff from your PC. Try using this utility to be sure that EVERYTHING is wiped w/ no residuals:
and then use the *Minimal* driver which is only the core components w/ none of the ReLive stuff. It can be downloaded here:
Hope this helps.
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The Relive (DVR) part of the Crimson drivers is turned off by default. So it should not use GPU resources by default. If you are on windows 10 the Microsoft Xbox DVR could be messing around.
Here is how to disable Xbox DVR Disabling Xbox DVR in Windows 10 - Documentation - Knowledge Base - Steam Support
Check the settings of the game maybe they are on ultra and you played on high or medium settings.
If you want to uninstall Crimson Relive here is the AMD guide How To Uninstall Radeon Software Crimson ReLive Edition from a Windows Based System
Then install the version of Crimson Relive, Crimson or Catalyst driver you choose.
Other way to uninstall is to use DDU, but this can uninstall other AMD drivers (like chipset drivers), so you have to reinstall chipset drivers and GPU drivers again.
DDU can be downloaded here: Official Display Driver Uninstaller DDU Download