In the case of the Minden accident, there was correspondence on Rec.
Aviation Soaring when the report was published by others who had
experience
of the inadvertent deployment of the brakes at high speed in turbulence;
the suggestion was that deployment may have been uncommanded.

I had an unintentional airbrake opening on my ASW24.
I asked other ASW 24 owners on our Yahoo group if anybody experienced the
same thing. Apparently I was the only one, so far.
Very scary indeed. I installed a lock to prevent it from happening again.
The flight was through many vertical gust for many miles.
On one very powerful one it let go.
Regards
Udo