Most of the guitars I've had have had an issue with the G string staying in tune. It seems like no matter what when I use a tuner it either is sharp or flat, and the needle just goes back and forth and never stays in the middle like the other strings. When I try to play octaves on the A and G string, it always sounds like **** and out of tune. It drives me nuts. Is this an intonation issue? Is it just that the G string has the most strain on it because it's in the middle of the neck? I have Schecter C-1 Elite and I use Elixir strings.