I have to echo the above suspicions about RFI. Program crashing plus the transceiver locked in transmit sounds very RFI-Like. In addition to the suggestions about grounding and using ferrites, I have had success in reducing RFI by reducing power output and physically spacing my computer farther away from the antenna & transceiver.?
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Even if distancing components farther apart doesn't work with your setup, it could be helpful temporarily for troubleshooting.?
Drew