I haven't experienced freezing, however I've noticed that once in a while I get quick glitches on a PVR'd show. My audio keeps going, however the screen goes black for about half a second, I havn't noticed it lately but I will definitely be keeping track of it when it starts happening again.
It'd be interesting to note down the following:
X SD or HD show?
X If you rewind, does the skipping/freezing happen at the same point in the show
FYI I have a 1 year old house, CAT5E directly from the phone line to my Gateway, then CAT5 direct to the HD box. No other boxes hooked up.
LG 47LK520 - Denon 1910 - Bell 6400 - Harmony 720 - Optoma HD200x -Pro-Ject Xpression III