It could be your lucky day
I too have had random crashes with my vega 64 for years ive bought power supplies sent back the card and its always the same
dont really matter what your doing you just crash
you can be watching youtube or playing the latest AAA game it can last for hours or 10 mins and you will crash
the fans spin to 100% black screen you need to reboot and when you get back to windows everything looks ok the temps are all reasonable and nothing is standing out
well a few weeks ago I started thinking maybe its not where everyone has been looking
I noticed if I turned off my 2nd monitor I wouldnt crash and ive never crashed as a single monitor setup
but if im playing a game and have youtube on my 2nd monitor it would cause me to crash more often
so overtime ive done these steps and so far ive not crashed
i enter watman set the power limit to -42% and make a fan curve different more gradual and it kicks in at a lower temp because i noticed the fans wouldnt spin then they would spin and i was thinking if this was a spike in power then having your fans all kick in maybe at the same time the graphics card is asking for more power might send it over the edge
2nd thing i was thinking about the cables in the back of the pc and when i looked i noticed my graphics card has 3 dp ports and 3 hdmi ports so i moved the cables to different ports incase it was one dodgy port (just for reference i put mine in the two hdmi ports which were next to each other in case yours is the same )
but i was thinking maybe having one monitor on dp and one on hdmi might be another option to try
3rd thing and last thing i did i was looking at the browser thinking its strange that when im watching youtube while playing i crash more often so i looked around incase something was up
and noticed they all have hardware acceleration so i turned it off you will find it in settings in the browser
ive also read that turning off vsync can help ive not done this yet as ive been stable for a week so far but it would be what i will try the next time i crash or having one monitor on dp port and one on hdmi
it might help