I have two 7100's and both seem to 'lock' the microphone PTT from time to time. That is, a transmission will be made, and unbeknownst to the operator, the rig is 'locked' in the transmit mode. Rig has to be keyed (mike button) pushed again, to 'unlock' and go to receive. Has anyone else had a similar experience? If so, any remedy? Steve, K2OMP