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Is the audio from the tv or a home theater receiver/system?
Is this on dvd or blu-ray disc's only or both?
Does the actual units turn on/off sounds work fine?
When the audio is not working please press the on/off button on the unit not the remote and let me know if the button's shutoff tone is heard?
What I am asking you to do is to press the button I want you to press the on/off button when there is no audio from the disc, press the on/off button and when you press it you should hear a tone, let me know if you hear this tone?
I am having trouble responding to you. Yes, the recorder beeps when I push a button but no buttons were being pushed when the audio cut out. I never use the buttons on the player. I had to return the offending DVD disc to the rental place so we can no longer test it. My player is working normally again with an owner furnished disc so I think the problem has to be with the rental disc. What say you? Have you encountered this problem previously?
I would continue using your discs that are store bought and see if you have any further problems, if the problem is only with rental discs then that may be the problem, in all honesty I have had lots of weird problems from Samsung blu-ray players including audio loss problems. For now since the problem is gone there is no further testing until the problem where there again.