brushless problem

[b4-man]

Hia
just recently i have made the jump to brushless as i blew my brushed speedo up and it got replaced by an lrp ai non pro version but i have installed this into my car with an lrp erasor 15.5 and ae xp servo and this is where my problems began i placed it down and it begun to start and stop when i am on the power i have tried a few things ( crystals, sensor wire, reciever ) but i just cannot think why it happens would anybody be able to shine any light on the subject as i am completly stumped.