How many amps are you pulling with your set up?????
Might be the problem. I just checked, the 370s are only rated to a max of 7 amps depending on kv rating. I imagine the 400 is in that range also.
Note also, my experience with the E-flights haven't been very good, I went throught 7 of them in under 6 months, all replaced under warranty by Horizon, on last one I had them replace with a Hacker 49. No more problems.
