1 bishop 5 months ago I recently bought a used 2016 G5420T in Fairlane Blue. They guy was an acoustic player and didn't bond with it so he sold it for half of a new one! His loss, my gain. I suspect one reason he didn't bond with it is the intonation was way off. I adjusted it and sound got much better. However, the B and G strings keep going out of tune... especially the G. I will get it in tune, play one chord (not even a bend) and it will be way flat. I changed the strings and everything was fine for a week or two, but now its back to going flat all the time. If I tune sharp, then it seems to stay in tune.Is this a tuning key issue? Nut issue? Any other thoughts?