This also just happened to me today. I was having issues with my computer even before then with windows explore running in the background and using high memory and CPU. I restarted the computer and then loaded up Beat Saber. then I played a song and halfway through it, the screen went black. and exactly like you said, the right eyepiece started to glitch out like a static tv screen, but the lines were diagonal from bottom left to top right. I don't know if its the computer or the HTC. I don't seem to even have a 3-1 cable so I wouldn't say its that, but I'm thinking somehow the monitor in the inside got damaged somehow, or there is a loose wire inside or my HDMI coord is going bad.
