I have a 522, I use it in single mode operation. I have not heard any problems. I have seen the video skipping/freezing also without any audio problems, both on TV1 and TV2. If I jump back, it plays correctly.
I am experiencing this in Dual Mode - the TV1 output to Channel 3 (and the TV2 outputs to composite/rca) is fine, only the TV2 RF output to Air/Cable is affected.