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XF 1.3 Server errors

Although I don't see a cron job set for 6:00 am every day, I get about 50 server errors every morning at that time. Here is a sample - can someone give me a clue what is happening. Seems connected to the import map. Import was done in 1.2, these errors were showing the same before I upgraded to 1.3 a couple of days ago, same errors showing.

Error Info
Zend_Db_Statement_Mysqli_Exception: Mysqli statement execute error : Prepared statement needs to be re-prepared - library/Zend/Db/Statement/Mysqli.php:214
Generated By: Unknown Account, Today at 6:12 AM
Stack Trace
#0 /var/www/vhosts/onlinetradersforum.com/httpdocs/library/Zend/Db/Statement.php(297): Zend_Db_Statement_Mysqli->_execute(Array)
#1 /var/www/vhosts/onlinetradersforum.com/httpdocs/library/Zend/Db/Adapter/Abstract.php(479): Zend_Db_Statement->execute(Array)
#2 /var/www/vhosts/onlinetradersforum.com/httpdocs/library/Zend/Db/Adapter/Abstract.php(808): Zend_Db_Adapter_Abstract->query('?????SELECT old...', 'thread')
#3 /var/www/vhosts/onlinetradersforum.com/httpdocs/library/XenForo/Model/Import.php(351): Zend_Db_Adapter_Abstract->fetchPairs('?????SELECT old...', 'thread')
#4 /var/www/vhosts/onlinetradersforum.com/httpdocs/library/XenForo/Model/Import.php(461): XenForo_Model_Import->getImportContentMap('thread', 578507)
#5 /var/www/vhosts/onlinetradersforum.com/httpdocs/showthread.php(35): XenForo_Model_Import->mapThreadId(578507)
#6 {main}
Request State
array(3) {
  ["url"] => string(156) "http://onlinetradersforum.com/showthread.php/578507-U-K-Retail-Sales-Highlights-The-Session-New-Greek-Government-Wins-A-Vote-Of-Confiden?p=720393&viewfull=1"
  ["_GET"] => array(2) {
    ["p"] => string(6) "720393"
    ["viewfull"] => string(1) "1"
  ["_POST"] => array(0) {