My 722 has been dropping the signal but if I hit guide and exit it comes back right away. also I installed a OTA about two months ago and i got shocked when installing it (I used a Diplexer). I also noticed I get shocked off any of the cable lines (only have the two going to the 722). I have also noticed that when I turn on the 722 it take a few minutes before it will respond to the guide button. Thanks for any of the help you might be able to give.