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First gen Stryker 955's occasionally had issues where the connector pins would corrode.  The point from the face pcb to the main pcb and it would cause similar faults. Disconnect, clean with isopropyl and reconnect can fix the issue on a Stryker (also made by qixiang)


I would check those connections to start with.


(I don't think this below relates but food for thought)

On another radio, early at-6666 they would burn the mic connector ground trace which was remedied by jumping a new ground path via a wire jumper. That also caused a similar issue. That was remedied by Anytone in the more recent q6 by adding a resistor in the mic pcb itself.