My Sennheizer Ew100 series wireless mic keeps turning off all by itself. The moment you speak into it it shuts of, but it will remain on as long as you do not speak into it. What could be the problem here? I live in Jamaica and it doesn't seem like we have a dealer here to service it, I usually send it to Florida for repairs (at a high cost) but I don't want to have to use that option if it is a program solution or other simple fix.