I have a problem with a TK-2170. It' receives just fine but when I go to transmit on certain channels it doesn't go out or is muffled according to dispatch. I've tried replacing the antennas, taking the speaker mic off, and then just using the portable speaker w/ no luck. I've double and triple checked the programming and thats all fine but curious if there is something else that needs to be done before I send it off. I have a TK-2180 and 7180 that work fine but this one is giving me problems