DG-1000 undercarriage collapses and inadvertent extensions ?

Our DG-1000 at Southern Cross Gliding Club (Camden, NSW, Australia)
has experienced multiple occurences of both inadvertent retraction and
extension of the undercarriage. Typically the undercarrriage has
dropped down whilst in flight, in various modes including straight and
level in smooth air.
We have also had a collapse on outlanding in a moderately field, and
very recently the gear collpased seconds after the glider had been
wheeled into the hangar; luckily no-one was injured but the wings hit
adjacent gliders.
The local DG agent has stated that he has not heard of any other
reports of DG-1000 U/C problems; however recently we heard another
Australian DG-1000 at Beverley in W.A. experienced a collapse (and
it's only a few months old).
It appears the overcentre mechanism requires very careful adjustment
to prevent the extension problem, however no apparent cause for the
retraction problem has been found. We have continually cautioned
pilots to make sure the U/C handle is pushed flush with the fuselage
wall after putting the gear down.
We are wondering if any other clubs or owners have experienced this
problem?