Intermittently, Nat Geo HD and Food Network HD will get this glitch where I will lose satellite signal about 10 seconds after I tune to them. If I change channels and immediately go back, they come in fine, but then I lose signal again approximately 10 seconds later. Rinse, repeat. Satellite signal strength during these periods is typically good with 103 (cb) signals in the 90+ range. Transponder 6 was reporting 95% on both lines. I have an HR21-200 and a Slimline-5. No additional hardware (the cable runs directly from the outs on the dish to the receiver). I perused the forums and google to no avail. Any ideas?