Security alarm on 1998 Ford Taurus

My security alarm just spontaneously activates while my car in sitting in the driveway – usually in the middle of the night!

I recently moved to a new home, and this started happening several times a week. I talked to the Ford dealer, and they do not think that anything is interfering with the radio frequency. But, it seems odd that it only started after I moved. A train passes nearby – could it be related to that?

This is making me crazy & I’m about to just have the security system disconnected.

Any ideas about why this is happening & how I can prevent it would be most appreciated.