I've been hassling with this buzzing A string for a while on my bass. It seems to be specifically related to the truss rod. The only thing that I can do to get it to go away without adjustments to the truss rod are to keep my thumb on the back of the neck while I'm playing anything. So anyways, I took it to a repair guy a while ago, and he was able to fix it. Then, once I started lessons again(back from college) It reappeared. My teacher told me to tighten the truss rod which I did and the buzzing ceased again. It came back again so I tightened the truss rod a bit. So far its fine but I don't want to be adjusting my neck this often. Aside from getting a new neck what would be a less temporary solution to this?