Hey wylk,
thanks for your comment my IT friend helped me to evaluate the problem and you were right with the DNS cache problem! We now flashed the DNS cache but also reset the router etc. I had to redo my cables anyway as I bought a new and better surge protection from Brennenstuhl.
Everything back to normal now, thank you 🙁nod):
Sorry for bringing that up here but I was a bit out of ideas, happens to the best I assume 🙁rofl):