Just a few thoughts: It is possible you have a bad (blown) speaker on the buzzing radio or the radio has another problem.
A few things you might try include: 1) Cleaning your battery contacts, 2) trade batteries with the known good unit and see if the problem is solved, if so replace the battery, 3) check the mic and speaker holes on both units to be certain they are free of debris and/or stickers covering the holes. 4) if none of these solve the problem, then your radio likely needs retired/replaced.
Answers & Comments
Just a few thoughts: It is possible you have a bad (blown) speaker on the buzzing radio or the radio has another problem.
A few things you might try include: 1) Cleaning your battery contacts, 2) trade batteries with the known good unit and see if the problem is solved, if so replace the battery, 3) check the mic and speaker holes on both units to be certain they are free of debris and/or stickers covering the holes. 4) if none of these solve the problem, then your radio likely needs retired/replaced.
Best regards.