Transmitter Indicator Lights

HI, have recently purchased the Duet headphone, they are working great but the back indicator led is flashing all the time. Audio is good through the headphones and sound bar. why is this flashing?

[AvantreeOfficial]

Sometimes if the volume is low, the back indicator LED will flash even if there's a valid audio signal.

Thanks mate, that could answer the question, as I said, everything is working great. best idea we have had tp purchase these units.