Built a new computer about two months ago with Windows 10 and a Sapphire Radeon R9 390 graphics card. Everything was fine for 2 months but now every so often the monitor will go black, the fans will spin at max but the audio will continue. What's weird is that this only happens most frequently when I'm watching youtube and only once when playing graphically intensive games. I tried resetting my graphics card in the mobo to no avail. It's drivers are up to date so I'm at a loss.