Steps to reproduce:
1. Go the Recordings->Series
2. Throttle connection speed to Fast 3G in your browser
3. Type into the search field
Whenever an AJAX pending request is cancelled, the message "Oops! The server seems to be unresponsive. Please try again later." appears.
This is a quite critical bug as it suggests that Opencast is not working stable although everything is just working correctly except of the incorrect notification.
There should be no such error notification if Opencast is working correctly.
Workaround (if any):
Ignore. It does not actually cause any harm but rather just suggests a non-existent problem.