It can be the speedo at its limit.
Thats because at the limit its unable to supply both the BEC and the motor with sufficient current, and the BEC is losing out.
I had this at the weekend with my B4. I thought I was getting interference because at certain points I'd just lose control of the car, throttle and steering. But it couldn't be that as I was on 2.4ghz.
What it turned out was I was massively overgeared (fitted the wrong motor basically) and when I hit full throttle the current draw was such the reciever got no power and cut out.........
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