Dell DA300u suddenly stopped working

Hello,

 I've just recently bought a Dell DA300 USB-C Dock for my XPS 13 (9360). But after just one succesful test it's functionality broke down.

• I've connected it to another USB-C Port
• I've connected it to another device
• I've searched for drivers (there are none)

Is there anything I'm missing here? Or am I just unlucky and should return it?

Greetings Pierre