Ah, another "maintenance-free" brushless motor with a cogging problem.
Try going through the ESC's setup process again. If that doesn't work, odds are it's off to the warranty department
Faster Than Factory
On The EDGE Racing, est. 2001 - Home of the 524, the Silverado Slammer E-MAX6X6, and the Sand Dollar prerunner
Mike Budzien | facebook.com/OTE.TheMissile | RIVCO Products | The RC Corral | iRacing.com