Why is my S6 not fast charging anymore?

[AC Question]

My Samsung Galaxy S6 suddenly stopped fast charging. I've tried everything I can think of; I've cleared the cache, I made sure it wasn't the charger (roommate has an S6 I tested it on, and I've used several chargers/usb cords), the fast charging option is "On" in my settings, I've also done a factory reset. Anyone have any other ideas on how to fix this? It says "Cable Charging" whenever I plug it in. I'm at a complete loss. Any suggestions would be appreciated. Thank you.

 

[lucianus_luciferus]

it probably means that there is a fault with the usb port