I'm also having a problem with my locals here in Buffalo, NY. According to the channel map, WGRZ is on 99 transponder 21. I check my signal, and it's consistently 95+. The install is fairly recent, and brand new cabling was run for the install.
Occasionally, the signal for WGRZ will completely fall apart...macroblocking, total audio loss, and it's impossible to watch. This even occurs with perfectly clear skies.
I have a pair of HR22's, and both of them exhibit the same issues with WGRZ, and occasionally with my other locals (WKBW and WIVB), but never as severely as WGRZ. Does anyone have any suggestions as to where to begin troubleshooting?
Chris