@Joseph-TP Thank you for your answer!

@Joseph-TP Hi, The Vodafone modem and router keep disconnecting, the internet LED goes out. I've changed the cable several times, it's not a cable fault.

@Joseph-TP Hi, The interesting thing is that the WAN connection LED does not turn yellow when it is disconnected but goes out completely. And only restarting the router helps. Why is this possible?

With my Vodafone modem, the connection drops every day or two. Modem CH7465VF