I was thinking my PC had something wrong because I started to have to click my mouse more than once and when I would click and drag to select some text when I let up the selection was gone. I tried another mouse and didn't have the same trouble so it seems to be the mouse. It's a Logitech and has been used pretty heavily for something like 5 years. So I guess I just wore it out. I did find some pages that talked about replacing the switches inside but for the price I will likely just get a new one. just never had this happen before.