Sterling JP60 keeps going out of tune

Sterling JP60 keeps going out of tune

I recently got my hands on a used Sterling JP60. This is my first foray into the world of floating bridges, so I am looking for some advice on a problem I’ve been having – while the guitar is in excellent condition otherwise, it currently seems to be pretty bad at being in tune. I did a few iterations of tuning the strings one by one, but after 15-20 minutes of playing, all or most of the strings go out of tune, even if I am not using the whammy bar too much. I have checked the locking nuts behind the headstock and they are tight.

Apart from taking it to a tech directly, is there anything simple I can check for beforehand or fix by myself?

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Source: http://forums.ernieball.com