I just received a new Fender Duo Sonic. Everything seems to be fine except that the high e and a little bit the B, buzz. The relief seems correct but the string height for that E string is maxed out at the highest level. If I try to make it higher the little screws fall out. So my question is, is this defective and I should exchange it or is this fixable and worth it. I know I can put in a new nut, but if it's been cut a little bit lower I'll have to start making some adjustments. I just don't know if this is a sort of thing that would be expected and up to me to fix.