The car alarm in my 2007 Prius went off four times this morning.

Has anyone experienced Gen II alarm going off randomly? This morning. mine went off four times, and I didn't have the key in my pocket and sat on the panic button or anything. No one was around the car. It just went off four times, about every 30 to 45 minutes, and now has not repeated this for about three hours.

I don't think my neighbors will like it if this starts happening in the middle of the night.

I replaced the 12 V battery about two years ago, so I don't think it could be a low battery problem.