I have a VHF CDM1250 (I don't have the firmware and model # info in front of me but I'll get it) that behaves badly. At seemingly random intervals after power up, the radio locks up / goes brain dead. The display and backlight are still on, but it doesn't receive anything. Button presses do nothing--it won't even shut off without pulling the power off of it. It was being used (in receive only capacity) in a very warm room, but a) it wasn't *that* warm, and b) it still does this on the bench. I haven't done a lot of troubleshooting on this yet, but just wanted to see if anyone else has experience with this issue.