I bought a new graphic card (Rx 580, 8gb) I tried it for a week and it worked, but after turning off my computer and turning it on the next day, it didn't work properly. I don't know what happened because I have all the Radeon drivers updated and the graphics are not optimal. I re-installed all the drivers and it worked! But after turning off and then turning on it happened again 
I hope you guys can help me
