I really hope someone have a solution as I'm really out of clue on my next steps..Tried everything I could think of and so tired of it..
The most similer issue that someone had + he had a really similer hardware to mine is -
Tried the solution there but no luck unfortunatly..
Alright so some background..
I started my experience with the VEGA 64 when I had the Sapphire VEGA 64 Air version which after 6 month of use became dead... With Amazon awsome support I was able to get a refund for it (Even that the one that should have care for that issue is sapphire as it's their warranty) And when I got a refund I decided to rebuy again the VEGA 64 this time the ASUS Strix version..
I cant recall when the problem started but one of the things that might affected (Again cant recall if the problem was before I did it or after) was when I decided to transform my whole PC to Liquid Cooling from ekwb,So I took off from the Asus strix vega 64 the air cooler and successfully installed the Liquid cooler,Turned on PC temps looked fine and I was happy of course..Till the issue started to became more frequent....
Alright so hardware is -
This isn't just VEGA. In game my RX580 black screen's ALT-TAB out and its fine. sometimes it quick black screen but others it's quite a while, DDU and fresh driver installed doesn't fix it
Try checking with Asus about your warranty regardless, they may still help you.
Depending on your region if you put the stock cooler back on the card, warranty may still be valid due to right to repair laws. "Warranty void if removed" stickers are un-actionable in the US and other countries, and mostly help with the manufacturer diagnosing a solution by telling them if the card has been disassembled or not.
Give it a test with the stock cooler again. If the issue persists, contact Asus, it doesn't hurt just to check.