Rotax 582 rod big end failures

I'm curious if anyone has experienced or might have some insight as to
why the Rotax 582 (blue head) seems to be prone to bearing failures on
the connecting rod big end. I have examples of this occuring on three
engines, all of which have about 250 hours on them. These engines have
been carefully maintained and followed the factory service
recomendations to the letter.

The failures have been occuring on the magneto-end cylinder and seem to
be initiated by a failure of the thrust washer on the rod big end. The
exact same thrust washer failed on all the engines. (The one that fails
is the thrust washer on the mag-end cylinder, PTO side of the rod.) When
the washer fails, the rod gets hot enough to severely distort it and
lock the engine. There is no indication on any of the engine gauges
(CHT, EGT, water temp) that anything is wrong unitl the engine begins to
loose power and then locks up a few seconds later. There is no
indication of a lubrication failure either (all the engines are oil
injected).

The problem has me stumped. Any ideas?