Except the USBc. Not sure if this applies to all models of the t480 series but that connector was slowly breaking down with each use, until it partially worked as charging slot and all usb functionality was lost.
I went trough 4 different docks until I realized who the actual problem was, and the internet was full with similar issues once I knew what to look for.
For some reason my nearly identical, slightly newer, X1 doesn't have these issues.
Yes, the connector is a little loose now and the cable comes off easily. But you can use the other connector so its not really an issue for me.
Also it sounds like you may have the infamous issue where the firmware of the charging port cease functioning. I strongly recommend updating the charging port firmware to anyone reading this if you have a T480.
I went trough 4 different docks until I realized who the actual problem was, and the internet was full with similar issues once I knew what to look for.
For some reason my nearly identical, slightly newer, X1 doesn't have these issues.