Chaosmoto

Have a spectrum dx3e radio with Sr300 recieve on my crawler, at full steering rate I lose signal between reciever and radio, if I turn the rate below half no problem , except a have no turning radius . servo is a savox -sb-2270sg monster torque brushless digital servo 440 oz torqe . even no load it cuts out, motor and esc setup is a Novak Timbuktu 18.5 crawler, powered by a 7.4 3300mah lipo,s , in full balanced order. Also radio batteries are full charge, , could I be getting radio interference from the servo, or is my reciever crap and shouldn't have been so cheap on the radio, any input would be appreciated