This is an issue that came up a few weeks ago, something I experienced then and now. Also list your ISP and country, that was one of the issues then as well.

I also found that the problem isn't always present, as I have multiple shortcuts for the launcher, so it may be a localised pc issue or something else. (My partner is able to log on with no worries on the same modem, so there's that too).

In regards to the ISP issue, mine is;
ISP- TPG
Country- Australia