thanks for this, i am infact having the same issue and i suspected it was the boot sensor in mine as i could see the interior light coming on and off at times, do you know if the boot sensor is inside the boot catch, or is it likely to be something seperate.
If your light is coming on too, it'll be your boot.
I stripped all my panels off to see if I could find the sensor and even stripped the locking mechanism itself and couldn't see an obvious sensor, I believe it's somewhere in the locking mechanism, but like I said earlier, moving the bit where it locks onto which is attached to the car up/towards you like 4-5mm fixed the job for me and should do the same for you.
Alternatively you could get a new lock from a ford dealer which costs around the £46 mark, but you'll more than likely still have to move up the bit it locks onto!
Let me know how it goes!
Sent from my Xperia Z1 using Ford OC mobile app