Havoc Pro HV 4.5 Or MMM 2650 SC truck

Running the Novak Havoc Pro & HV 4.5 on my Jammin SC10. Has plenty of speed on 2s 50c, 5000mil with 14t pinion. Problem with ESP. Shuting down after 1 or 2 laps. Would stop for a couple of seconds then start up. Was not thermaling out. Switched batteries full charge and ran great. Got to mains with same battery and same prolem. ESP & motor were at safe temperture. Frend has the same set-up with no problems. Think I will put in my Tekin Pro in it.