I honestly can't remember if this has been posted before, but it certainly can't hurt to bring it up again if so...
For some time, maybe the current software version or maybe longer, a momentary loss of signal during a recording will often cause the receiver to fail to play any audio after the video has resumed. The audio is in fact recorded, and backing up carefully to just after the signal loss will make it start playing again, but I shouldn't need to do this. (In fact, the audio ought to be MUCH easier for the receiver to reconstruct than the video, so maybe it's just failing to sync it to the broken video? Just a guess of course.)
For some time, maybe the current software version or maybe longer, a momentary loss of signal during a recording will often cause the receiver to fail to play any audio after the video has resumed. The audio is in fact recorded, and backing up carefully to just after the signal loss will make it start playing again, but I shouldn't need to do this. (In fact, the audio ought to be MUCH easier for the receiver to reconstruct than the video, so maybe it's just failing to sync it to the broken video? Just a guess of course.)