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Mute button won't give up

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Mute button won't give up

I have an X1 cable box with a Panasonic TV and a Sony BlueRay/Home theater combo for sound (instead of the built-in TV speakers).  I have successfully paired the X1 remote to the TV and the Sony; the volume control works.  The problem is that if I mute the sound, sometimes it won't unmute.  It's only sometimes and I can't figure out the conditions that trigger the problem.  Has anybody encountered this?  I had the problem with my old equipment when the trigger was using the mute button before the Sony had a change to fully initialize (there is a small blip on its front panel that signals readiness).  That is not the problem because it can now happen long after the equipment has started.  Any solutions out there?