Sounds like the PTT button is loose or the switch it actuates is rattling while in the microphone holder. I am familiar with disassembly of a lot of locks and safe parts as a technician that deals in what I refer to as "small stuff repair. I am wondering if this situation occurs frequently and if so, what would be a good cure?
I am confortable with disassembly of the mic. Or is it a, "Just buy another one," kind of item?