This exact thing just happened to me last night when I was restringing my ES-335. It has a Bigsby and I put a bend at the ball end of the string to help keep the string in place while I tighten it up. Just to be clear it's NOT a kink or a corner but a smooth curve. The ball end fell out of the high E string when I bent it. I figured it was me but reading this post and thread has got me wondering. Other than that one issue I've been using D'Addario strings for years. When I'm gigging (which is quite often lately) I change them weekly so I've been buying in bulk too. For me DA strings are the best compromise between price and quality I've found.