XPR 5350e Transmit issues

Hi, I have a couple XPR 5350e’s installed and one of them just started to beep when you transmit on channel 3 but receives just fine on channel 3. All the other channels work fine, only this one channel we are seeing an issue with. I went ahead and swapped this radio with another 5350e and all was fine for a couple days now I am getting this same issue… beeping while trying to transmit on channel 3.

We do have a repeater but I would expect the transmit issue would be across the board and not just one radio.

Any suggestions on where to start? FYI no changes have been made to the system over the last 3+ years.

Kurt