9.1 update has brought pixelation back to my S3

Got the new 9.1 update last weekend on my 2 S3's & unfortunately it has caused a couple of my HD channels to have pixelation/picture & sound breakup. This is after I've been completely free of any video problems since last winter's update. I'm using them with OTA + cable & have had them since last Fall. To be clear: I didn't change any of my setup, I've had most of the Tivo models they've sold, it's present on both units, & it started occurring directly after the updates (updates were on different days). On my NBC channels (D.C. & Balt), the break-ups are the same as what many have discussed with the new HD models - every 3-4 minutes with severe pixelization with a skip of sound/video. This was what had me return a HD unit after trying it for a week. This break-up also is similar to what I experienced with the S3's pre-8.3 & on my previous HR10, so I'm very familiar with this flaw. This only occurs with HD shows & NOT SD material airing on the same HD channels. On the CBS channels, the pixelization is totally different. No breakups, but instead it appears as video noise or random blocks of digital artifacts. I haven't seen any problems yet with the ABC or FOX channels (related to 720P?). I'm curious if anyone else has experienced this. If 9.1 doesn't include support for M-cards or TTG & just adds wishlists features, I would much rather have my 8.3 back!