I had a Slimline Dish installed recently, and was checking the signal strength for transponders on the 99 and 103 satellites. When I check the signal strength, I will see certain transponders -- usually the same ones -- show 0 intermittently. However, if I retest them, they will jump up to middle or upper 80s. These transponders are denoted in red below. For example: Sat 99 Transponders 1 - 8: 86 62 88 91 95 73 NA NA Sat 103 Transponders 1 - 8: 85 93 87 95 86 90 NA NA Transponder 17: 0 (always) My concern is that I will have intermittent problems switching to channels on these satellites (especially with DirecTV 10 going live very soon). Any thoughts on why this would be happening? Alignment issues? Cabling problems? Software glitch in HR20 receivers? For reference, I checked the signal levels on two different HR20-100s receivers and got the same results. Location: Springfield IL.