Oddly enough, this happened to me <and> one of my buddies last night, then again to me today. I was at my friend's place for a kids birthday party, he has a 2019 Expy that was parked behind mine on the street. At around 730pm last night, both of our alarms started going off simultaneously, but neither of us got a warning in the app. Today at 11:48am, my alarm went off again even though the truck is parked in my driveway and is still secured. This time I got a warning - "E's security system has detected vehicle intrusion and triggered the alarm...".
He told me that his alarm did NOT go off at the same time as mine today. I suspect something upstream is going on.
hmmm...