Hello Black Mamba,
Thank you for this advice which I followed to the letter but unfortunately it did not resolve my problem. Despite the reset and resynchronization using the ethernet cable, the WLAN-Box no longer picks up the signal when I put it back in its initial location. Everything is fine in the same room but as soon as you move away from the internet box it glitches. I think it is defective but I don’t remember what year I bought it.