Intonation went overnight.
Recently purchased a great Gibson J-15 on this forum and love it. However, a couple of days ago, it seems like the intonation was way off and it appeared to happen quickly. On the low E, it starts getting sharp on the first fret and by the third fret, it's waaay sharp. Same on the high E (the only strings I tested with a tuner). I just changed strings on it but issue didn't go away. Does humidity (or lack of) affect intonation? I'm struggling to keep the humidity in the case at 45%. Any ideas?
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Martin 000-28 Ambertone (2020)
and four ukuleles. I don't have a tuba. 
Last edited by Kerbie; 01-16-2018 at 05:28 AM.
Reason: Edited title
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