MOST kiteboarding accidents are weather related. Knowing what weather to look for and to avoid is critical knowledge for all kiteboarders. Quite a few ideas are presented at the following links:
http://fksa.org/viewtopic.php?t=130
http://fksa.org/viewtopic.php?t=579
Develop a good feel for the weather and changing conditions. This should help you get more good riding time in while hopefully avoiding the odd bad session.