I was reading the link provided by Reportage, there are many discussion in that forum. In one
of the thread, according to the 6 individuals that have failed 5D MKII are in this range of
serial no: 320105XXX, 032010xxxx.
They are saying it might be related to a particular batch. The rest of the other 20 5D MKII
users that did not have any problem even in the same wet conditions as the 6 users who
have problems, they have different batch of serial no.
They are trying to draw some conclusion if it due to manufacturing defects.