Damn man, sounds like somethings going on there. Yeah, go back to stock and just leave it on for a little while, don't play any music for a while and then test. Also, how's the power cable, is it securely connect? Is your DV plugged in to the wall or from a power board? Try the DV in another room perhaps? I dare say, you might have a crumby tube, that's if the stock tubes are running fine! Good luck @Jamie G.