Internet not working from past week

Moin Moin,

is the connection slow with cable or with WiFi?

If the connection is slow with WiFi could you check it with calbel?

if only the WiFi connection is slow that try a nother channel.

You could restart the router remove power from the router for 5 Minutes an reconnect.

Manuales could find at Router Anleitungen und Handbücher: Hilfe im o2 Service ansehen 

Im talking about mobile internet

With your adress you could check for trubbel at o2 Störung? Netzausfall & Netzprobleme im Live-Check prüfen