I don't want to be rude and butt-in here but Sappy1 is not responding, I have the exact same issue with my RX6650XT, and I do not want this issue to be overlooked.
PSU: EVGA Gold 500W
RAM: Corsair Vengeance LPX 2 x 8GB DDR4 3000Mhz
CPU: Ryzen 5 3600
GPU: RX 6650XT
MOBO: b450-m pro4f
I have air cooling, its never been an issue before, the CPU is always typical values. And yes, 1080p.
I have a friend who has the exact same build and has the exact same issue. I do not get this with games such as Rocket League, Minecraft, PUBG. Only Rainbow Six from the games I play. Any help would be much appreciated.
Edit: I just want to state that the issue is that I will be playing and suddenly everything goes black and the PC will restart, this might happen 3-4 times per ranked game, thus 3-4 times in a 45 minute period.