BCD Knife

[whodunit68]

I have the Akona BCD Knife for my Sherwood Avid. I bought it and got the knife mounted (after some challenges). As I was climbing the ladder after a boat trip, the knife went tumbling (yes of course I checked it before the dive). So, I bought another knife. I am now very aware of the tumbling and extra cost so I check it carefully (unfortunatelly just like my Sherwood regulator that fell apart), and don't ya know the next trip it happens again. Yes, as I'm climbing the ladder. This time the divemaster was able to get the knife (we were only in 20 fsw w/ great viz) so I have it but now I'll never put it back. So, the question is - has anyone had this experience with this Akona BCD knife? Has anyone had luck with it (contrary to me)?
Akona - is this a known problem and is there a solution?

[Sherwood SCUBA rep.]

Have you checked out the Sheath? It may be the sheath and not the knife.

[whodunit68]

Have you checked out the Sheath? It may be the sheath and not the knife.

of course and there's nothing obvious that I can see. thanks for the thought though.