Headlights flashing..
 

Hi, I have a 2000 eclipse gt. Recently I've been having a problem where my car will be parked outside and randomly from time to time I will look out to see my headlights flashing as if my alarm was going off along with hearing a relay clicking. It stops once I open the door with my key and relock it, I do not have a remote and I assume it's still the factory alarm in the car. I also just today let the car sit when it happened and the lights stopped flashing by themselves after about 5 minutes passed. Not sure what is going on and it's driving me crazy trying to figure out what is causing it. Has anyone else dealt with the same or similar problem and had it resolved?