Epic Games Launcher crashing Internet connection

I try to install UE, but when I start downloading it through the Launcher, it works for ca. 2 minutes and then crashes and says there is no internet connection, but Windows says it has. It does no more use internet in the taskmanager. After that, all other programms I have installed do not have internet anymore until I restart my Computer. I tried everything I could find on the internet. After I installed the Launcher, Windows now starts from my other screen and then switches back again to the usual, but I can live with that.
I did not install or download anything else before.
I included debug logs and my DxDiag. Please help me.

Debug Info

Epic Staff will tell you that launcher problems are now to be handled through help.epicgames.com instead of this forum.

I looked there and there was nothing. Seems that I have to annoy someone by sending an email.

Yep, that seems to be what they want for launcher stuff now.