what gives? I'm I just cursed or do all the G5's have loose sensitivity buttons. The one I just got, and I've tried many, is great except for the - sensitivity button is loose feeling. The + button is solid. The - button works ok, but wonder later if it will just stop working. I'm not sure about Logitech's QA at it's production sites. Are they all pretty much like this? I've had at least 3 or 4 ever since they came out and all of them had either bad scroll wheels or loose buttons. I HATE loose buttons. 