[creedo]

What mr. x said.. it sounds for sure like one of those tiny pins is bent, usually they get bent so that they lay too flat and the phone doesn't see one of them. In this case a pin the phone isn't supposed to see is bent the other way and is touching a contact on the charging cord that it isn't supposed to.

You need to flatten it out, but I have no idea what tool you could do that with without damaging the pin. They're so easy to break and hard to get at.

If you get desperate, and you're gonna try to send it in anyway for repair/replacement, on idea is to plug in a charger firmly with the phone laying flat and push dongle sticking out of the phone downward. Not too firmly, just a bit. This may push the pin back into place. Or it may make things worse. lol.