Where have been for the last 6 months man?
The 1st run of 1000 MMMs resulted in about 80 or so dead units after a short period of time (that numbers only go to increase as time goes on, but its not so bad really).
The 2nd run which is at 3000+ units has resulted in a few dozen dead units- not so bad, but it seems that a few users are ending up with escs which die, and so do the replacements; several times over.
given castles good customer service, its nothing to worry about- have a read of the castle sub-forum for more info.