Last time I had a motor take on a life of its own with a properly-configured receiver, it turned out that the relays in the motor were sticking. Hopefully that's not the case and it was just a receiver glitch.
FYI - an OCTAGON SF8008 can blind scan and lock those CHINA RADIO signals at 900 SR @45w. might be worth a look in. i know, its been driving me nuts for weeks...3 receivers later , and i can get it - both a blind scan and a manual tune gets it.