Has anyone ever had the issue of the front doors unlocking and the front windows dropping down, whilst the car is stationary, not in use and locked. This happens a number of times whilst the car is on our drive. I have changed the battery in the fob as I thought this may have been causing this, but it still continiues from time to time. We have a Chrysler Grand Voyager 2011. Can anyone suggest something to rectify this please?