As I was watching ABC last night, with lots of lip sync problems, I thought about starting a post on this topic. Well, here is one already.
In a little over a year with HD, this is the number one annoyance for me and my family when watching HD programming. Varying PQ is not even close to this problem. You never know when it will happen and, if it is really off, the viewing experience is especially annoying. There have been times that the sync was so bad, we watch the SD satellite broadcast, which is ALWAYS ok.
While I appreciate that there is a learning curve, I also believe that networks and stations monitoring their own transmissions should be able to do something to correct iton the fly. Yes, changing the channel sometimes helps (DTC-100), but not always.
I think I even read that a new Pioneer Elite receiver had a feature to correct for sound sync timing problems. Needing that feature, if true, in a receiver is really ridiculous.