I have now bought a waterproof casing for my Countour HD and would like to hear from anyone who has used for a caving trip. Any condensation??

I have tried the waterproof casing on a canyon/gorge trip to Afon DDu and after 2 hours the turn off button wouldn't turn off the camera but when I opened casing I could turn it off just fine, somehow even though the casing seems to be quite tight around the camera it must have allowed for some shifting, enough for external bottom not to fully operate the inside one.

Has anyone experienced this?

Nat