Caitlinnt

Hi, My dad has a 2009 X Type Jaguar and has owned it for a few years now. Recently the alarm has started to go off during the middle of the night for no reason at all. When you unlock the car it stops but then you can’t seem to lock it afterwards and the horn toots twice as if you’ve left the door open or something. I can say that all the doors are shut. Has anyone ever had this trouble with there’s and knows what it could be??? It has left us puzzled. Thanks!