My 722 (3 years old) loses it's signal and I get the message to unlpug for 10 seconds and reboot it. Now this always works and I can still watch OTA but this happens way too often (every 2 weeks or so) and naturally right at the worst possible moment. I have no obstructions and the wiring connections are tight. Does anybody else have this problem? I haven't called to have it checked but that may be my only option.