Before this problem happened, my key fob was about 1/2 block (200 yds) away from the vehicle and could have been pressed. I am not sure if it was pressed, as it was going through a security screening checkpoint at the courthouse. Not sure, but perhaps this could have contributed to the problem.

When I returned to the courthouse today I used a different entrance and security screening checkpoint much farther from my vehicle. I requested the security guard to please not push any buttons on the remote, because "I had a Crossfire and they were potentially sensitive". I got a strange look from the guard, but he did not push any buttons on the remote. My car and remote and alarms all worked fine when I returned to my car today.