This is probably not a #DataCamp exclusive, but I can't recall when it has happened before.

After several hours of doing coursework, you get a page that just won't finish loading (neither the 'run code' nor the 'submit assignment' buttons load). Typically, when that happens, just go to bed and reload in the morning. (Reloading doesn't help ... I suspect that the company has to reset something, which gets downloaded when someone resets overnight / early morning.)

And it is Monday night / Tuesday morning, so there's not the "urgent" necessity for their technicians to do infrastructure work overnight ... I honestly think a server gets "stuck"