The night before last my receiver updated to L648. Last night a thunderstorm came through and I got the dreaded "total loss of signal "screen. I left it that way and took a break but before I could do anything, the receiver crashed, rebooted, and got stuck on Acquiring Satellite Signal. I could hit the menu button, but option #1 would not display the guide. As a consequence, I couldn't switch to an OTA channel. Very annoying.