This sounds like you have low battery in your TRC remote.
Try to replace the batteries and you will see that the "bug" go away.
In earlier codecs Cisco had a warning for low battery displayed on the screen(MXP3000 and previous), this feature is not available in C-series and new SX series codecs. Some times the codec interprets the "low battery" message by lowering the volume.
Please get back to us with the result with trying new batteries in your remote
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