I just replaced the strings on my sheraton a few days ago and the low e string already sounds dull. All the other strings sound new and bright but the low E sounds like it needs changing already. I have probably only played on them for 2 or 3 hours. Maybe I'm just hearing things but it also sounds like I have a phaser on when I hit the E string open. Could this just be a bad string out of the pack? Is it an issue with the guitar? If it helps the strings are ernie ball 10's. Advice would be appreciated.