I have this problem since I bought my graphics card. In some games like DOOM or Far Cry 3 after a couple of minutes I get a black screen. The gpu priority switches to the on board graphics by it's self and I have to change it again in the BIOS menu. I installed the latest amd drivers with clean installation(DDU), nothing changes, I still have the same problem. The weird part is that I play battlefield 1 and mass effect andromeda for over a year now and it didn't happened once. Temperature seems fine(70 Celcius max)!
Specs:
CPU: i3 6100
GPU: Asus rx 470 4gb
MOBO: Asus H110 M-K
RAM:16 GB(Dual Channel)
PSU:Corsair vs series 550w
Specs:
CPU: i3 6100
GPU: Asus rx 470 4gb
MOBO: Asus H110 M-K
RAM:16 GB(Dual Channel)
PSU:Corsair vs series 550w