I have RX480 sapphire nitro+ 8gb. I always use latest updates. 1 week ago i saw my GPU is going 75 degrees idle when PC was just on desktop.. Normally runs 45-50. I tried to update my drivers but nothing happened.. then i tried to use older drivers and i fix the problem for a few days. But always when restart my PC the problem comes again... Today i tried again to change the drivers and tried both old and new drivers. After driver installation they want to restart my PC but i tried to postpone it for 1-2 hours and before the restart everything was fine.. my GPU was running perfect, but when i restarted my PC again to full complete driver installation.... 75 degrees just 1-2 mins after reboot.. My PC is 1 year old, intel i5 7600 3.5-4.0 Ghz, 16gb ram DDR4 and AMD Radeon RX 480 Sapphire Nitro + 8gb DDR5 GPU.