To narrow down the source of problems, the player/tuner sends to my TV. When the TV (tuner) is operated without input from the player/tuner, there are no problems with audio. Removed/replaced cables from player tuner to AV receiver. Changed from optic to copper, without correcting the problem. Because normal operation generally returns at start up, heat must be factor.
Oh, when using the player/tuner for movies, there is no lost audio.
AV receiver that plays the audio from the player is fine with other sources of input.
Is it reasonable to suspect that audio could be dropped from random channels by the player/tuner?
Any suggestions for locating the problem OUTSIDE of the player/tuner?
*** Sorry, this is my first day on this forum, and I posted the above elsewhere before discovering this discussion about the MDR513H/F7