@Marvin_S thanks for your answer.

Thanks the problem seems to be with Vodafone. I will report the recurring fault to them. Before that, I'll swap the TP Link router for another VX800 model to see if it improves.

Marcus

  @auslandjack2 yes there ist no new firmware.

I was hoping it would get better with the Last firmware update. Unfortunately, I am not aware of any way of logging the DSL router. That will be difficult to prove to Vodafone.

  @Marvin_S Hey, thanks for asking. It currently looks like this. Vodafone has asked Telekom to send a technician to check the line. I opened a ticket and the outages were discovered and partially fixed. The technicians installed a new Telekom socket here on site. We have a building from 1959 or so and the copper lines have not yet been replaced. Unfortunately, our landlord doesn't do that. We are waiting for the fiber optic expansion, which the technician recommends, because the cost of replacing the cable is too high.