Sorry about this.
I haven't seen this happen, and I don't see anything in the logs on my side that would explain it either - so I'm not sure what to suggest.
For example, if you see this screenshot of my developer console when I access Scratch, I can see the versions of the individual files that are loaded, I can see that almost all of them were not actually downloaded but rather loaded from cache from previous visits, I can see the messages that were printed to the console as those files were loaded, etc.
All of this is a description of what happened when I accessed Scratch. The equivalent info from your browser will likely contain the explanation for why your browser failed to load the page.
Kind regards
D