I recently received a replacement FT3D after returning my previous radio for a faulty screen. A day after receiving the replacement radio it became stuck in transmit after sending an APRS beacon. It had been sending beacons happily for the previous 30 minutes before this. It has now frozen on transmit 4 times in the past two weeks and appears to be totally random. I have reset the radio a couple of times to no avail. Does anyone know what may be the cause? Is this another faulty FT3D?