Midland Micro Mobile GMRS MXT400 .... When I press the PTT on the microphone the unit beeps, shuts off and turns on again and shows PUC100 on the screen. Also when I turn on the unit it also shows PUC100 for a second. I've factory reset twice and tried 2 different antennas and sent question to Midland support but have not received a reply yet .... Any help would be appreciated ! Thank You