I have a similar issue (HR44-500) and my equipment is only 2.5 months old. It's typically on the local HD's. KPIX (san francisco CBS) is worst, but I've noticed it on KGO (ABC) sometimes. it also happened during the NCAA basketball game last night on truTV. If ok, I'll post my signals also. Comments welcome.
sat 101deg W
1-8 95 95 95 99 95 99 95 99
9-16 95 96 95 99 96 99 95 98
17-24 95 59 95 100 96 99 95 99
25-32 95 0 95 67 97 99 96 100
sat 110deg n/a
sat 119deg n/a
sat 99deg
1-8 80 89 80 85 77 85 79 85
9-16 77 85 79 83 82 88 n/a n/a
sat 99 deg
1-8 86 0 83 0 82 0 n/a n/a
9-16 n/a n/a n/a n/a n/a na/ 95 0
17-24 98 100 0 0 39 51 94 95
sat 103deg s
1-8 77 0 74 0 n/a n/a n/a n/a
9-16 n/a n/a n/a n/a n/a n/a 97 0
17-24 97 10 0 39 0 0 96 99
sat 103deg ca
9-16 76 82 83 84 74 79 79 83
17-24 74 79 81 83 73 77 80 85
sat 103deg cb
1-8 79 85 79 80 76 84 77 80
9-16 76 82 76 80 76 84 n/a n/a
I have a SWM dish, but got nothing else. if I omitted a row, it was all n/a.