For some time now my HR21-700 has had a "glitch" in the video. When first turned on, every couple seconds the screen would freeze for a split second, then continue on. It had no effect on the audio. If I pushed the reset button it would clear the problem until I turned the TV off. The next time I turned the TV on, the problem would be back. I called Direct TV and the rep had me run a system test. The codes indicated an internal problem, so they shipped me another receiver. The new one is an HR22-100. Since I got the new guide update, the problem with the old receiver has stopped. I did a system test, and it still has the same fault codes, but seems to perform OK. My question is- Should I go ahead and replace it with the new one, or leave it alone?