While watching DISC-HD tonight, the screen and audio froze. Then the screen filled with uniformly spaced zig-zag lines with a black X in the middle. /\/\/\/\/\/\/\/\/\/ /\/\/\/\/\/\/\/\/\/ /\/\/\/\X/\/\/\/\/ /\/\/\/\/\/\/\/\/\/ /\/\/\/\/\/\/\/\/\/ Then after 15 or 20 seconds the screen blanked and the unit rebooted. It took nearly 5 minutes for the picture to come back on. Most recent activity before freeze: Browsing the channel guide. Didn't see anything good. Pressed cancel on remote. About 1 minute later is when screen froze. Boot V: 120B Flash V: F051 SW V: L142 921 is fed directly from Dish 500 Quad LNB. No switch. No timers set.