Lucky you. I recall seeing at least 2 other people in this thread who had the same issue with the buttons popping off. The rubber contact cone losing traction is probably rare though, I haven't heard others having the same issue other than Narval above... I had another issue with the focus/zoom drive gear losing its pin so it was free turning without engaging the inner gear (that drives the zoom/focus gear). I was in the middle of a trip and had to temporarily fix it with tooth pick (which disintegrated soon after), a twist tie (wasn't staying on), and finally a plastic cable tie just forced in there and cut off both ends. All these happened within the first 3 months.
I guess I am the really unlucky one, but I haven't had other issues for the last 6 months (~60 dives) now.
In my housing the inside rubber contact wheel also lost contact with the camera's dial, and I had to change to a slightly larger diameter one. Some times I still experience slippage, and I just have to jiggle the inner cone-shaped rubber contact around and it would work again.
Also, you will probably soon find the dials caps fall off the camera (the metal disc that has the markings), you will just have to glue them back. I believe it happened to several people.