Why does Slide doors and lift back door open & shut without using key fob?

Your description is woefully inadequate. So much must be assumed. If both the side doors and also the rear lift gate open by themselves when the car is parked and the fob is not within 100ft of the vehicle then you have ghosts. No, but seriously....there are two control points that can affect both the side doors and the rear lift gate. A fob and the overhead control panel between the driver seat and the other front seat. If none of your fobs have been damaged and seem to be working ok then I would think the problem is with the overhead controls. Those doors mostly wont operate when the vehicle is not in park, so it must be assumed that you do not experience this problem while driving. But really need more info on this. When and where do you experience the problem and is anybody playing with the other fob perhaps playing a nasty trick on you?