I had this same problem of cutting out and it does seem to be the voltage cutoff. I was having the problem when I had it in the 1/5 scale bike with a 3.5t motor + lipo, it just cut all the time, but now Ive got it in my 501x with a 6.5t motor and lowish gearing +lipo and its fine on the same settings. I forgot to change the setting to Nimh when I swapped to 6cells which bloxed my race, but that was my fault
