I had same exact problem. There was a thread about this wahile back but never got a definitive answer. I tried process of elimintation but could never figure out if it was the MAG-10 the Workout fuel or the combination of those with the Anaconda that was doing it. Problem was it didn't happen all the time. One day fine, one day no good and so forth. Could never pinpoint if the culprit was all the casein hydrolysate and leucine, the creatine, the beta alanine or the citrulline maleate. Frustrating.