Why wired internet won't connect

My Switch OLED HEG-001 won't connect to wired internet throw the dock. Switch charges in the dock and the image is transferred to the TV. The device was purchased on December 2023 and previously worked. My older switch HAC-001(-01) works fine whit same dock. There is no visible defect in the USB-C port of any devis. The connections are fine, because the assembly works with the old switch. I use the later dock that came with the Switch Oled. Devices have the latest updates.

- Is there any reason to suspect that the USB connector is broken?

- Could the problem be somewhere else, like the motherboard or software?

- Any ideas what to do?