Sometime in Drupal 7 the Boost 's cache is flushed during the cron without respecting the Boost maximum cache lifetime setting, this happens when the cron is running and there is an attempt to re-run it, something goes wrong and the Boos'ts cache is flushed. To solve this problem i made that the Boost's hook_cron is executed for last using the function hook_module_implements_alter : function...