Locking gone weird???

Guys,

Every now and then, the range decides it wont let me in - if I unlock it with remote, it then locks its self straight away. Unlock, it locks, unlock, it locks. Occasionally it will trigger the alarm once I've got in, then I press the remote to unlock and it stops - what is going on with my bewitched car???

Sometimes the lock linkages bounce causing it to re-lock - I had this on a my 3.9 Classic....I cured it by adjusting the linkages to stop them moving around and bouncing.