It might actually be the port is jammed up with dust on the devices you have used so it couldn’t fully insert and lock in. Being that lightning is a decent sized hole lint gets in there and then when you plug the cable in you compact it all down and it eventually keeps you from fully inserting the cable but it can often still charge though sometimes it is a bit finicky. I clean my out about once a year due to this, haven’t noticed in 3 years of owning a device wearing out the clippy/spring dodads.