I have tried the Cloudflare DNS solution (changing DNS to 1.1.1.1 and 1.0.0.1, etc.) but nothing has returned successful, other than switching networks to my mobile hotspot.
Have you tried using a different browser?
EDIT: If changing a browser solves the problem, use this browser, eventually try reinstalling your favorite web browser.
I assume that you can’t use Roblox while using any device and this Wi-Fi router specifically. I did research and you are not alone with this problem recently. I will look into that more in the near future. You said that you tried Cloudflare DNS solution, which is I assume a solution from this topic: "Your connection is not private". Is it correct?
truly amazing how such a large-scale connection issue can just be ignored by a company. 17 billion dollar market cap, yet no teams to fix their service issues. Legend says Roblox is supposed to have engineers working on these errors, but alas, it be a myth, a mere fantasy.
edit: forgot to say, this has been happening since 11/09/23.