Got a new 400 and it was setup perfect when I first took out of the box but after 3-4 days started getting fret buzz on E/A strings from the 4 fret and higher. Changed the strings, helped a little but now buzz is back. I figured the humidity/environment change may of affected the neck so adjusted the truss rod about a 1/2 to 3/4 turn but that didn't help either. Has anybody experienced this with a new 400? I've adjusted FR guitars so I am not afraid of doing it myself but this is my first new guitar. Is it normal for the neck to need adjustment like this? Do I just need to put a couple of more turns on the truss rod or should I raise up the bridge? I bought it online so I would have to stop it back for them to adjust it. Will Epi take it back and adjust it for me and pay for shipping?