Quoting .:Mary:.:" Im not stalking you Edee, you just happen to be the only one in my parentank posting Anyways we ... [snip!] ... be the batteries, or maybe there was wind at the back door? Could have also been someone thinking your house was still empty?"
I originally thought that it might be someone who thought the house was empty, but nobody was there, and to get into our back yard, you'd have to hop a few of my neighbors' fences on either side or go through the garage. There's no other way. I don't think it was anybody, though. It had to have been a malfunction, since the system was unarmed.