Imaginary friend disappeared and relationship gone

I have left my lot with and without my imagineMe Doll. Now it no longer works. I can only tell it secerts and play. I cant summon it any longer and the relationship is gone. If the child goes to school this doesn't happen. Just when they leave the lot. I have reset my child sim and the doll with no lucky. I have the wild child doll and I have changed his personality. I have had this happen twice with this doll. I sold it in bulid buy and bought a new one. I have hit send back to imaginary land on this doll and was able to have him come back.

Question for EA---Will child sims send them away forever without the player doing this?

I have another child that has the red doll i rename him and gave him a different personality was well. Im not having a problem with him. Not sure what is going on. I have not hit send back to imaginary land on this doll.

Save and loaded the same game. Wild child doll is reset now. Have to start over again with him but I guess this a way to fix it.

Another thing that has worked is having my other child reset the doll.

Playing on xbox