System re-armed by itself

@alarm_5742114 there are many posts over the years in the forums where customers have reported this behavior.  I suggest you start with the timeline and see what was posted and note the sensor and times. Using that information, you can call SS support and troubleshoot.

Are you sure someone didn't arm the system on their way out or in with that door open?

If you do, the open door will be ignored until it's closed then the system will treat it like any closed door...will trigger the alarm when opened.