提BUG时，文字和上传的图片经常会消失

14:49:34 PDO::query(): MySQL server has gone away in lib/base/dao/dao.class.php on line 694 when visiting cron-ajaxExec-0
14:49:34 PDO::query(): Error reading result set's header in lib/base/dao/dao.class.php on line 694 when visiting cron-ajaxExec-0
14:49:34 ERROR: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away <p>The sql is: SELECT * FROM `zt_config` wHeRe owner  = 'system' AND  module  = 'common' AND  section  = 'global' AND  `key`  = 'cron'</p> in lib/base/dao/dao.class.php on line 1381, last called by lib/base/dao/dao.class.php on line 699 through function sqlError.

 in framework/base/router.class.php on line 2308 when visiting cron-ajaxExec-0

什么问题？

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