Nice what kernel/driver version are you running? Lost track of what's going on with AMD on linux side with their open source vs closed drivers.
I'm using Ubuntu 20.04 with kernel 5.6-rc1 and drivers from Oibafs ppa right now, but the card has been working just fine for me since kernel 5.4 (the first I tried iirc, got the card before christmas) and during the 5.5 release candidates (with Oibaf drivers).