I have a 2000 ford taurus and latley the car has been locking and unlocking itself. I have a remote for it, and when you lock it and push the button twice it locks and beeps the horn. Well it has been doing that the past two nights. The remote is nowhere near the car and it continusly locks and then unlocks itself until i got out and use the key and start the car and shut it off. It will be fine after that anywhere from 5mins to an hour. Any idea what could be causing this?