Mine creeps pretty bad... If i've got the camera hanging by the strap around my neck for 5-10 minutes, guaranteed by the time i pick it up, it will be at the 105 position... granted, it's my go-to lens and it goes with me just about anywhere my camera goes and frankly doesn't go off unless i need something it cant deliver such as WA or beyond 105 or razor thin DOF... I suppose the more you use it, the more "wear and tear" it will get quicker. Just about every one of my lenses creep if they extend, I just assumed it was a nature of gravity... my 17-40 and 70-200 doesn't creep, but they dont extend.