Every time I pick up my M307 it's detuned a few cents, even though it's locked and the trem is blocked
Strings are stretched in nicely so it's not that, they're only a couple of weeks old and it did it a little with the last set too. It didn't always do it though, it just started to one day. Halp?
My only thought it is the neck is shifting due to temp..or humidity.