@Rastigani
I only added the router as it could be that, not saying it is that.
My bet would be on Telekom because they always like to push the blame.
I spent 4 hours at a residence with a Telkom tech one time trying to fix a phone line connection and they kept on saying it was the internal line that had the problem and not them. After exhausting all options on the site with no solution the Telekom Tech went to the nearest main trunk line connection off site 300 meters down the road and found out the issue was with their Trunk line.
Irrespective of what service provider one has in Germany once the internet connection leaves the building it connects with Telekom's main trunk lines, Telkom is the sole owner of all of the main lines in Germany. This goes back to when Telekom had the sole monopoly on Telecommunications in Germany until it was broken up and other ISP/Telephone providers could provide services yet Telekom still owns all of the main trunk lines.
EA's servers are not the best and we all know that. EA could and should do better here.
However in Germany we are at the mercy of Deutsche-Telekom.