This is my 2nd iphone, and the 2nd time the volume button has gotten messed up. wtf?

I had one of the original iphones, and the volume button got stuck. it wasn’t bad at first. it still worked, it just no longer really “clicked”. but then it got worse, and eventually got permanently stuck in the volume up position, so that everything was at maximum volume all the time. it really made the phone unusable. i now have a 3g, which i’ve only had, maybe, 6 months, and it’s doing the same thing. it’s in the early stages, still working, just sticky, but i have a feeling it’s going to go in the same direction.