Three things.
What temps are you actually seeing in the speedo. Just saying "it should be ok in a 2wd" doesn't really cut it!! One of the guys racing yesterday has had some overheating problems in his 210. (Fanless ESC) And i've had one hot enough to make me think twice about touching it (210 again)
And what servo are you using? If its a Savöx, they can do funny things to the BEC/ESC as the battery discharges! i.e. high current drain at certain points on the track can make it brown out as the voltage dips, even tho the battery is still good to go. A glitch buster can fix this.
Also, check the motor wires are soldered properly, i had an intermittent problem like this due to a badly soldered motor connector, once it got hot it cut out and stopped working properly, by the time i got to the car, it had cooled down and started working again. Until the solder joint actually separated properly!
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