Okay fellas, I finally got to race yesterday and I thought I would post a conclusion to my findings. I swapped out the servo and the ESC bench tested fine. Took it to the track and raced it yesterday and it ran fine all day long. I am guessing that the JR z9100s was over amping the ESC. Thats a shame too, that servo is fast and smooth. Still works great, just draws too many amps for that ESC when used in rapid back and forth operation...such as S-turns etc.. Bottom line, I did not have to send the LRP ESC in for maintenance.