I have. The friendly ones do tend to go off on their own frequently. Now I will say that Betty goes off on her own frequently but not to see me.
The thing about Betty is she was full grown when she came here. The others who are tamed, will not let her come and spend time with me. If I'm out there they all cluster around and if I would try to tame Betty with some food, they would all push her out of the way. It is essentially impossible to sneak for past Aurora and now that she is in charge, the tribe comes with her.
In Betty's defense, she knows her name. She comes when called just like Phyllis. So if she is off on her own, I can call her to me. I just don't know if we will ever have the opportunity to develop a relationship where she is comfortable eating out of my hand like everyone else.