Hi, I was playing on my Atari 800 and started to get randomly red vertical lines covering the whole screen for a moment coming and going (showing for a sec and disappearing). Then, it stopped to disappear and was (red vertical lines with a very small distance from each other) displayed continuously. I restarted the game with the same result and even switched off the computer. The red lines were on the colorbar test pattern as well. I switched off all the devices, checked the cable and powered them up again. All is ok again.