i too have had problems with BR straps, one time i wash shooting in Florida, a fashion shoot on a boat, the boat took a turn a little too sharp, and my D4 + 70-200 Nikon lens detached it self from the strap and went over the side of the boat and duly sank.
I now use thread lock on the mount to make sure it's secure and i check it before every shoot where the camera can get damaged.
i feel for you, as it's never nice to see a camera get damaged due to a part failing.
I use BR straps because i don't see a good enought alternative on the market.
oh. my. god. 0_0 did you franticly jump in the water to get it? or did you just see it godown and that was that.