Ive been getting fret buzz on the a string between the 10th and 17th frets, and also on the 23rd.The guitar is an Epi SG strung with 11s tuned standard.What do you think this could be and how can I fix it?Its really annoying, Im not getting buzz anywhere else.I have raised the action but its just too high for me now, I want to be able to lower it with no buzz. Thanks for your input.