Just switched from 2 6 cell 4200 nimh to 2 venom 5000 7 cell. Emaxx ran for 5 min then kaput!!! Esc didn't smoke or anything(lights still work) motors are ok! Traxxas said they would send me a new one (mine is 3+yrs old) said it had low volt det, my ? Is y would the lvd help not being a lipo and is the new esc gna break again ?