I just changed strings for the first time ever the other day and the A string ended up snapping. I've heard of how breaking the E string is fairly normal but I'm kinda kicking myself for it being the A string. I had everything in tune when I noticed the A string was way looser then the other three, it was even smacking the pickup when rather lightly plucked; I thought it was an octave down. Since the other strings were holding up fine at that tension I'm wounding if I was at fault or if it was just a bad string. Thoughts? Any suggestions so I don't mess up when I put the stock strings back on?