I think the input connector/hole on my Dual Shock 4 controller is worn out because I get frequent connected/diconnected messages. The cable is relatively loose. It was like from the beginning, but got worse after a while. I don't know if its the cable that sucks or the controller input socket/hole. What can I do about it?
As for the subject, I'd suggest trying with another cable first.
If you have an Android phone from within the last 10 years, chances are you have another Micro USB cable.
If a cable doesn't fix it, it sounds like the connector on the controller may need to be resoldered.
If you don't have any experience with soldering, I suggest asking a friend or a pro who knows how to solder small parts. It's a 5-15 minute job for an experienced person, so it's likely still cheaper than buying a replacement pad.
As a last alternative, you can always use Bluetooth.