Kind of your internet provider? Do you have phone line or ethernet connection? Please explain us.

I can see that is something wrong with your phone line.

No problem, greetings from Poland!

The installer has now agreed to reinstall with cable. It is a good decision, you will be glad.

But as soon as internet goes down, connection to the router does the same, and after that i can see the router in the available connections but i can connect to it untill i restart the router btw...

Internet is not necessary to router setup.