Hey, I have the same graphics card and had the same problem in 2 different computers. This seems to be a common problem with this card with few solutions.
First of all, I re-pasted the card. The factory thermal paste was poorly applied and dried out after 7 months. This lowered my temps by 7 degrees C.
Here is a note on XFX's website stating that they do not void warranty for breaking the sticker if you live in the USA/Canada.
"Can I service my graphics card myself without VOIDING Warranty? For USA and Canada, you can service the graphics card yourself, piercing warranty stickers will not void the warranty. This includes replacing thermal paste, and cleaning out the fan/heastinks assembly of dust and debris. IMPORTANT: Any accidental physical damage to components on the card however will not be covered by warranty, servicing the card is only recommended for PC Technicians and other IT professionals. Please take care when servicing a card, components can be sensitive and delicate."
Now on to the solution that worked for me:
Link 1: https://community.amd.com/thread/232643
Link to the embedded link that worked for me: Solution to XFX Black Screen
I tried all sorts of other "solutions" but this was the only thing that worked for me and it has made the card rock solid.
Just a note, I did have problems with the Radeon Wattman software keeping my settings so I switched to using MSI Afterburner to manage the fans and voltages.
Ck10001 got a reaction from Bombastinator in GPU crash and come back? after playing games with XFX RX 580 GTS XXX Black Edition