I've got problem with my newest mando not staying in tune, but just on the A strings. #I can tune the pair, but after just a few minutes of playing, one of them is flat. #I've tried to verify that the nut and bridge slots are filed correctly (angled back towards the tuners and tailpiece), and changed the strings, but that hasn't seemed to help. #Any suggestions? These are Grover tuners, and the mando was just strung up about 3 weeks ago.
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