Found it:
- Go to:
<…>\Cyberpunk 2077\r6\publishing\x64
-
Create a copy of the “GOG” subfolder next to the original one.
-
Rename the copy of the “GOG” folder to “null”
-
Go to:
<…>\Cyberpunk 2077\bin\x64
and delete the:
GameServicesGOG.dll"
https://www.gog.com/forum/cyberpunk_2077/a_fix_for_the_crashing/post70
Well, as you said, the reason could be either your router or on the ISP side. If you have another router you can test (maybe from a friend?), that would be a good first start. Otherwise, you’ll probably have to call out an ISP tech to see if they can identify any issues.