We have the 913 Smartcode electronic deadbolt for 5 months and it seems that about once a month the deadbolt loses its mind.  It will start locking itself over and over.  I end up having to use the key to get in and then I have to take it apart so I can remove the batteries.  Once I put the batteries back into it then it will reset and continue working for a couple weeks.  I have replaced the batteries twice and that didn't seem to make a difference.