quark glitch?

[Manslaughter]

Hi, I have a E-maxx with a quark 125 controller with a neu 1515/1y, 8000 maxamps batteries, and stock transmission locked into 2nd gear. I am using the strobe slipper with the 51 tooth spur and a 16 tooth pinion.

I have a problem and I will explain it exactly as it happens: I accelerate to high speed. I brake and slow down to medium speed (Such as when I enter a turn). As soon as I accelerate again (Such as once I've entered the turn), the motor seems to seize for a split second, cause a shock in the drivetrain. Besides sometimes flipping the car over, this has also caused problems with my front diff. It only happens in this specific situation.

I have talked to quark about it and they assured me they have never encountered this problem before, and that is probably isn't a problem with the ESC.

Has anyone else had problem, or can anyone provide any insight into what might be causing it?

I suspect it might have something to do with the free-play in the e-maxx transmission.