Depending on state of ur lipo's if old it could be the voltage cutoff as if set to 6v( or 3v per cell) it could be under load ur going lower then that voltage that's y it works after switching it off and on
Even with good lipo's if the load is still high racing 13.5 boosted I got my voltage down to 5.7v ( recorded by esc) but lipo on the bench unloaded out of the car after a 5 min run I had 7.7-7.9 v
Speed passion esc are great but I had to run lipo cut/off off to have a trouble free 5 min race
But if ur just racing in the woods street car parks u need lipo cut/off on unless u keep an eye on the voltage as u can easily kill a lipo
Also If your using sub c cells pack the voltage drop is greater then that of a lipo also
Hope this helps
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