Q for Novak Rep, Motor problems ?

[Bondonutz]

I have a New HV 6.5/Pro that I've rewired per Novaks instructions to run a single 4s pack with Red wire pulled and a Castle BEC and have installed in a Traxxas Slayer. I have it set up with servo brakes,ESC set for zero brakes.
The problem is under half or more throttle especially WOT, it seems to loose power or stutters for a milli-second sometimes 5-6 time in a row very quickly. Under low throttle inputs it operates normally ?

When I drove it at the track Friday after running 10minutes or so the truck would surge slightly and shut off (like a thermal but it's not,it runs very cool). Let it stand and it would resume working but still stutter badly.(not cogging)

I'm using 30C 4s lipos and have tried different packs,Spektrum(antenna wire is fine),geared for 41mph and have tried pretty much everything to trouble shoot this but keep coming back to the motor and or ESC ? Shortly after purchasing this HV new the motor had a magnet let loose, I returned it and Novak replaced the motor(supposedly) with a reman but I haven't ran it since I received it back 8-9months ago till this install.

Any help would be appreciated because I know I'm SOL for warrentee work.

I even disabled the LVC and problem persists.

Any ideas ??