My Krptview a780 is barely watchable due to frequent glitches. It freezes then it shows "scrambled or no video". It will then come back maybe after about 1 minute. I timed to check how often it does and it is happening every 2 minutes. I am getting all the channels but they are barely watchable. Is there something that needs to be done to my box or maybe it has seen its better days. I have done several factory resets and rescans but the problem remains. It is driving me nuts. Any advice is greatly appreciated.