Error 500 checking out from github with svn - github

Question

I try to checkout my repository user/bar on GitHub using the cli-version of svn. This fails with error 500.
Note: Similar questions have been asked before, but are either slightly different or have (for my case) unsatisfying answers:
Error Connecting to GitHub from SVN got a different error message
git svn gives 500 internal server error got the same error, but only with git svn clone not with native svn
Subversion Unexpected server error 500 on checkout had exactly the same problem, but it seemed to have been a temporary problem on GitHub
Community Forum describes exactly the same problem, but got no response
GitHub Documentation says: make an empty checkout of the repository,
$ svn co --depth empty https://github.com/user/repo
> Checked out revision 1.
$ cd repo
So I tried to check out my repositories of foo (created months ago) and bar (created recently), and - as a cross check - a non-existing repository baz:
$ svn co --depth empty https://github.com/user/foo
Checked out revision 4949.
$ svn co --depth empty https://github.com/user/bar
svn: E170013: Unable to connect to a repository at URL 'https://github.com/user/bar'
svn: E175002: Unexpected server error 500 'Internal Server Error' on '/user/bar'
$ svn co --depth empty https://github.com/user/baz
Authentication realm: <https://github.com:443> GitHub
Password for 'user': ****************************************
svn: E170013: Unable to connect to a repository at URL 'https://github.com/user/baz'
svn: E160013: '/user/baz' path not found
Findings:
basically it works, otherwise foo would not be fine
bar exists, otherwise the error would would be like baz
A temporary problem seems unlikely (becaus foo works), but to be sure I've waited for a couple of days - no change. Configuration of foo and bar is identical (to the best of my knowledge).
Any more ideas?

Answer 1

More than a week after the original attempt it suddenly works as expected. So if you happen to run into the same problem:
it might affect only selected repositories
the temporary failure might last for quite some time