Car losing power with Trakpower Lipos

[carlin]

Hi Guys,

Wonder if anyone can help me.

I'm currently running the following

Associated B44
Novak GTB with 4.5 motor Brushless
Trakpower 4800Mah
Ko Propo 2413ICS
PT

The problems i'm getting after 3-4 mins running the car slows right down has no power at all. It doesnt shut off all it does is goes at 1MPh then after few seconds the power is back.

I have checked the temps on my motor and that is running at 70c but when i checked my Lipos they was very warm and temp at 52.3C so they was getting warm.
Someone mentioned to me could it be the thermal cut off but the motor isnt getting hot.
The only thing i could think off is the lipos are knackered i have only had them 1month only been run about 5-6times and everytime run them i got this problem. When i run nicads the car is fine no problems at all.
Thought was the motor taking to much voltage from the lipos but how do you know if its that or what, it's just getting abit confusing now as i'm not expert on this gone bit further than what i know

Hope someone can help me out really spoiling my racing now