I've gotten to know my Comcast DVR rather well over the past few months. Here is my take on your cited problems:
- The problems with audio & pixelation are most likely rooted in problems with your signal, not with the DVR itself. Especially if you are talking about digital channels.
- The "auto shut-off" is just the other half of the "auto turn-on," the feature that turns the DVR on to record a scheduled program. If the DVR was off to begin with, it turns off when recording is done. It would be nice, though, if you come home in the middle of such a recording, to be able to somehow tell it that you want it to stay on, so that your buffer is not lost.
- The mute behavior is related to the auto turn-on behavior. If the DVR is off when a scheduled program begins to record, it turns on with the sound muted. For some reason the Mute button on the DVR remote is initially programmed to control something other than the DVR
. If you check the internet you can find the codes to make the Mute and Volume buttons do the right thing. Then when you see "Mute" you know you just have to tell it to un-mute. No big deal, once you know.
- I have seen programs be just plain skipped, then continue to show as scheduled to record even after the show time has passed. This is definitely a bug. Generally this seems to be just one of many freaky things that begin to happen when the drive is much too full for much too long. Another is that it sometimes gets in a mode where the screen is always black when the DVR is first turned on, and the DVR does not respond until I begin to play a recorded program. Another is that pushing Replay too many times causes the DVR to spontaneously reset. Manually resetting (i.e., unplugging) always sets everything right again.
So, there are some behaviors that I just don't like, some that seem like bugs until you understand them, and still quite a few that are actually bugs.