we have 2 Sennheiser Evolution G2 100 mic systems (2 sets of 4). our number one was working fine and then during opening night, thursday, it cut out. at first we though that some one put it on mute but it wasnt. after checking the transmitter we looked at the receiver and found it to be unresponsive. you cant even turn it off. all you can do is unplug it. its not the body pack as far as we can tell. theres also a handheld that we run through that receiver. it doesnt currently share a frequency with another mic. it just wont respond to anything. any ideas on a frozen Sennheiser Evolution G2 100 receiver?