(string) connection unexpectedly closed (timed out?)

Query: SELECT SUBSTRING_INDEX(GROUP_CONCAT(keyword), ',', 8) AS related_terms FROM search_popular WHERE (keyword LIKE 'public sex%' OR keyword LIKE 'public%' OR keyword LIKE 'sex%') AND keyword != 'public sex' ORDER BY hits DESC LIMIT 8
Error Message: Server shutdown in progress
Error Number: 1053