We get this error message every day.
1]: ThinkingSphinx::QueryExecutionError (closed MySQL connection):
2013-08-16T03:14:08.605246+00:00 app[web.1]: app/controllers/licenses_controller.rb:137:in `destroy_school'
2013-08-16T03:14:08.605246+00:00 app[web.1]: app/controllers/licenses_controller.rb:317:in `block in destroy_licenses'
2013-08-16T03:14:08.605246+00:00 app[web.1]: app/controllers/licenses_controller.rb:307:in `destroy_licenses'

When we restart heroku server it will turn to works good for a while, but it will get this error for several hours later.

We find a solution https://groups.google.com/forum/#!topic/thinking-sphinx/5Zddl3kbt6o

  gem 'thinking-sphinx', '~> 3.0.4',
    :git => 'git://github.com/pat/thinking-sphinx.git',
    :branch => 'master',
    :ref => '0c404e756d'

But i need wait for several hours to wait for the result.

Our server is http://careereagle.herokuapp.com