strange PDOException error 1153 This morning my Drupal 7 site suddenly not working. I get the
"PDOException: SQLSTATE[08S01]: Communication link failure: 1153" error. The error goes away when I disabled "Aggregate JavaScript files." in config/development/performance page. I clear the cache several time, but when I re-enable "Aggregate JavaScript files" the error comes back. 

This error happens only on certain pagee.

Can anyone shed some light on this problem? It doesn't make any sense to me. Thansk.
i think you need to increase your max_allowed_packet in your my.cnf/my.ini in mysql,
maybe the problem is with packet size.