My STBs are randomly rebooting and coming back in learning mode on channel 134. When you go to live TV the guide isn't there and certain channels are "currently unavailable". You then have do a hard reboot by pulling the power cord out and putting it back in. After doing that everything is normal again. There is no pattern to it. Sometimes it will go a few days without rebooting. Sometimes it does it every few hours. Sometimes you can be watching TV, the screen will freeze, but sound continues. It was only the main box. Now it is all boxes. And the now the one box won't go back to normal and all channels are unavailable. Thoughts?