how do you have the inputs setup into the tivo unit? What are the coming from and do you have the source split anywhere? For an example if you have the audio coming out from your cable/sat box going into an A/V Receiver and then the video going into the tivo then yes the audio and video is going to be out of synch. Here check out tivo's article http://customersupport.tivo.com/knowbase/root/public/tv1070.htm?
If that relates, a little more info on your hookup will tell why it's happening either it being the hookup or the tivo unit.
If that relates, a little more info on your hookup will tell why it's happening either it being the hookup or the tivo unit.