I have a problem with the tailgate on my ford focus 1.6 Zetec opening, apparently on its own, when i'm driving! It has also started opening when I start the ignition and opens almost as soon as I close it again!

The offside passenger door also seems to have a mind of its own working intermittantly and usually stops working when it's deadlocked stopping me opening it altogether when it does and makes me wonder if the two problems are linked.

The remote key fob still works as well as ever opening the tailgate as well as operating the central locking with no difficulty although if I use the key to open the drivers door, thats all that will open. Is that normal?