Yeah, sounds like you either keep getting food from the same "off" batch, or that food is having a manufacturing problem.

Good luck finding a new food. You might also want to give some probiotics, like the mercola pet products, just as a bit of a tune-up to hopefully help ward off future problems.
_________________________
MaxaL (aka LisaT)

Jazmine, mini-mix, 10/18/2011
Max-n-Indy
Max, 5/2001-2/2012, RIP my partner, my Regal Boy
Indy, 5/1997-10/2010, RIP my friend, my teacher

Health Index
K9 TBD info and Tick List Links
http://www.rabieschallengefund.org/