There are a few potential causes for controller disconnections on PlayStation 4. One is that the controller may not be properly registered with the console. If this is the case, your controller will not be able to connect to your PS4 and you will experience disconnections. Another possibility is that the console may have been damaged and needs to be replaced. If this is the case, you will need to contact your PlayStation 4 retailer or Sony for assistance in getting a new one. Finally, it could be that your controller has been lost or stolen and you need to replace it. If this is the case, you will need to contact your PlayStation 4 retailer or Sony for assistance in getting a new one.