Channels go off after a few minutes.

Channels go off after a few minutes.
My headphones work great on my old Sony tv. But I got a new Sony for living room .Ever since I started using with new tv the sound goes off after a few minutes and sometimes will come back on a few minutes later Some times not. Have tried every channel I can and it still goes off. Put in new batteries also. Also there is noise now more than before. At this point they are unusable .Thanks

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