Odd keypad chime/beep

[torgrimj]

Not sure why this started...but at approx 1:00am my two keypads beep 2-3 times and then approx every 15 minutes repeat.  I have no rules around this, and there is nothing in the log file.  The beeping lasts about an hour. 
 
i want to get rid of it, as it wakes me up at 1....
 
Suggestions as to where i should start to look.....
 
Thanks
 

 

[Del91574]

System monitored?
 
Age of system battery?