Steps to replicate the issue (include links if applicable):
- Enter a deepcat query at Commons with enough results to show the "Load more" button at the bottom of the page (example)
- Scroll to the bottom of the page to load more results
What happens?:
Eventually additional results stop being loaded: the loading icon at the bottom of the page changes into the false "No more results found" message and "Deep category search SPARQL query failed" error appears underneath the search box. This can happen on the very first attempt to load more results or after several successful ones . The behavior is unpredictable, but failure seems to be more likely the longer you wait between attempts - you'll get more results if you immediately start scrolling to the bottom of the page than if you behave "naturally".
What should have happened instead?:
All results get loaded when "No more results found" message is shown.
Other information (browser name/version, screenshots, etc.):

