Calendar wireless syncing disables itself
 

For the past few weeks, a while after update to OS 337, I am experiencing the calendar app to uncheck the "wireless synchronization". That disables the over the air calendar sync and what is even worse after checking it again I am not getting the fully synchronized calendar back (it requires me to open each appointment made off line and save it again to get it synchronized).

Has anyone experienced similar thing? Is there any solution?