Hey guys, I have a question about my guitar. I’ve noticed that after tuning my guitar, if it sits for a few days without being played it goes out of tune sharp. It’s not just one string either. I’ve put a little graphite in the nut slots but it still does it. So I just tune it every time I pick it up to play. Why is this happening? Is it due to humidity or tempature changes or something? I would expect it to be flat but it’s just the opposite.