Thus far almost every test we have on this thread so far appears to have massive packet loss issues either at the router itself or between the router and ISP. There may be some kind of problem with the router you have been issued or the infrastructure near your house. Can the rest of you who are having issues please ensure you are running winMTRs for 5-10 minutes and posting the results? We need more tests to see if we can identify a common theme for the problem.
I’d also like to see if you can connect to another region. Before clicking “Play” on battle.net, change the “Region” drop down to another region. Are you able to connect to any other game regions aside of your normal region? (I assume you normally play in EU?)