I have the 650 and two of the 850's and have never had a bind problem. Do you have access to a second Tactic transmitter so you can see if it binds to it? If so, there may be a problem with your transmitter . I do not know if there is a difference between a flyzone plane and whatever brand receiver they use and a regular SLT Tactic receiver or not. The quickest way to isolate the problem is to substitute first one component and then other if you have access to a second transmitter or receiver. I've never heard of a partial bind, it is either bound or not bound.