Change your glow plug to a cooler one. I take it you are using the the one that came with the truck (hot) try a warm instead. Outside temperatures also affect the running temp of the truck.

Oh one more thing... what is the oil content in your fuel.....?

You should have at least 15% oil mixture in your fuel. I am using 18% oil mix with a 25% nitro fuel... the engine never shuts down on me.

I asked CEN Racing this question ages ago but i never did get a reply from them.