I have a Sony wireless lav that I've had for over a year. Recently it developed a problem that I don't understand. When I turn on the UHF Synthesized Diversity Tuner it works fine and the battery indicator shows a fully charged battery. The minute I turn on the transmitter the battery indicator shows an empty battery it blinks and then the tuner turns itself off. I have changed batteries, I have tuned it to different frequencies but nothing seems to work. I have another one of these mics and it works fine. Anyone seen a similiar problem with wireless?