this just started a week ago: watching the tv with this dish (722K) receiver - at different times the tv turns off. We've had this receiver for at least 2 yrs and hadn't had this problem til recently. the tv goes completely off (but the red dot on the left corner of the tv doesn't show as being off). Use HDMI cable to hook to DISH. after a little while, the tv then comes back on.... is this the receiver acting up?