This started about a few days ago on my 2011 Sport.

The car locks automatically as usual after moving off, and then after a few seconds or minutes unlocks/locks/unlocks. Unlock is the default position and this happens randomly, but regularly (sometimes continually) and it's driving me mad. I was hoping it was down to the hot weather, but no, it looks as if it's here to stay.

When parked it locks as normal and stays locked.

Any ideas anyone?