I have been quite happy with my Standard MIM Fender Precision, however, I have found a little problem. When I pluck the A string upwards, I have a perfect A sound, but when I stroke it downard, with pick or thumb or otherwise, it makes an obnoxious buzzing sound. Upon inspection, I noticed this buzz only goes away when I place slight pressure on the string just after the nut. I also noticed that the bend of the A string isn't as noticable as it is with the other strings, maybe this could be why I am experiancing this buzz? This normally wouldn't be a problem, but I am becoming more of a pick user from time to time, so any input would be helpful. Thanks.