I have a XTL 2500 that was working just fine. Suddenly TX has become garbled for both P25 and Analog. I swapped out the palm mic and it appeared to work again for a few days. Then went back to garbled. Is it possible that something internal has gone bad vs 2 different mic's suddenly stop working? RX has been fine when the TX worked and when it didn't. DOA? Need a new mobile? Thanks for any help.