A:Answer Hello Bertj ~ I researched and got this information directly from the Sony website. It sounds like a radio frequency problem to me. I also own these headphones and have them plugged directly into my optical port on the TV. I have had virtually no cutting out of noise. Anyway hope the following information helps you.
Follow the instructions below if the sound from the WH-L600 Digital Surround Wireless Headphones cuts out:
Make sure the battery of your headphones has enough charge.
Make sure there are no other wireless devices using the 2.4 GHz wireless frequency band or a microwave oven around the processor and headphones.
Switch GAIN on the processor to LO.
If you connect the headphones jack of the AV device to the AUDIO IN jack of the processor, decrease the volume on the connected device.
If there's an OPT terminal on the connected device, use an optical cable to connect the device to the headphones (as mentioned this is what I use and it works perfectly).
Set the output signal to 96 kHz on the device connected to the processor.
The headphones are compatible with 96 kHz.
Sound may be output for a moment when inputting a 192 kHz signal. This is a normal operation.