Damn, this is a 2020 post and nobody helped you ? I'm sorry to hear that, but happily i'm here for you because i got the fix, i have the same specs, an amd ryzen 3200g vega 8 graphics and 8 ram, i was getting freezes
everytime i was exiting project brutality cs go or other games.
What i did is that i kept downloading the driver from the manufacturer site a lot of times when i was having those freezes, but they kept coming back after a week so what i did is that i installed the driver from the AMD site using the auto-detect.
but before i did that i made sure my windows is up to date,once that, it been like 3 weeks since i didn't get any freezes, my pc usually freezed two times a week but now everything seems fine, so hopefully this will help.