I done a parse on a trial atronoch, no sustain issues but one of my guild members stated that I was doing more DPS than what Combat Metrics was displaying. So I checked for an updated version and yes there was a newer version. I downloaded it and installed, I went and did a parse again. Got the target atronoch down to 80% and ran out of resources, thought this can`t be right so I parsed some more and ran out again. So I put the older version back and no more sustain problems. i don`t know how Combat metrics could effect this but the fact that i`m doing more DPS than what Combat metrics is reporting then there is a sustain issue with the newer version just don`t add up.