Site slowing to a crawl, error 500 everywhere

#!
$ git checkout Story/ATG-6218
fatal: unable to access 'https://bitbucket.org/naturacode/rede-natura-atg.git/': The requested URL returned error: 500
Switched to branch 'Story/ATG-6218'

$ git checkout story/ATG-6218
refrror: RPC failed; HTTP 500 curl 22 The requested URL returned error: 500 Internal Server Error
fatal: The remote end hung up unexpectedly
Switched to branch 'story/ATG-6218'
Your branch and 'origin/story/ATG-6218' have diverged,
and have 21 and 22 different commits each, respectively.
  (use "git pull" to merge the remote branch into yours)
fatal: unable to access 'https://bitbucket.org/naturacode/rede-natura-atg.git/': The requested URL returned error: 500