This was usually due to lint clogging up the port on the device. You could easily remove it with a toothpick and then everything was back in working order. Took just a few seconds at most.

Sadly such remedy is not possible with USB-C due to the thin piece inside. :(

Try a paperclip or bobby-pin. Had to do that recently due to my cable not charging my phone reliably.

Nope, it’s not that. I’ve seen this behavior with a worn cable and a brand new device.