I'm having trouble with timeout errors on my system. For three years it worked fine, but now often the computer will not be able to even boot with a display working the first time I try to start it cold. I'll have to restart once or twice to get it to load. I've tried stess testing the card with Furmark 3D and it does just fine for 20+ minutes. But the timeout errors can come at any time. Often the system can't recover from them; the screen freezes, then acts as if it's been disconnected. Then the driver won't load upon first reboot.
I'm using windows 10 Pro on a B250i gaming motherboard from MSI, i5-7500 processor, 8 gigs of ram. PSU is a bronze 450W, and again, the RX 480 does just fine on stress tests, no issues with wattage or temperature. I'm running the latest updates of Windows and of the AMD drivers.