J
I have a 522 and ever since the firmware upgrade to L468 I've been noticing daily glitches with shows I've recorded and with playback of a show that I'm a few minutes behind on. The picture will freeze, stutter, and beep for a few seconds. Even when I skip back the glitch will remain. Again this is something that has only started occuring with the latest L468 firmware. Maybe this is a by product of an attempt at fixing that freez-up problem that has been so persistent during the first half of this year. 
