“Sony wireless headset MDR-RF985R From the first day I purchased it I began experiencing problems. The unit goes out of power so I loose sound despite the fact that the headset is fully charged. Then I have to unplug and plug it to electric source. There is always background noise that is annoying even though I keep changing channels. Finally, the only way I can turn this on is unplug and then plug. Only after this power comes with green light on. I don't understand the purpose of power button. There is no instruction that addresses these questions. I am very upset !”