Sounds like something isn't closing properley. You are pressing the lock button on the fob twice, aren't you? Mine goes off occasionally if one of the doors has not completley closed. The dealership told me that because it is such a sensitive alarm system that you may need to close the doors a little bit harder than you would normally, not slamming them just closing them firmly. I had a KA convertable as a courtesey car for a while and that had the same problem. You really had to slam the roof cover down other wise the alarm would go off, its something to do with the pressure pads inside the doors, boot and bonnet. Maybe one of the doors needs adjusting slightly????
