I believe The freelanders also have a switch under the bonnet , this may be worth checking to make sure the switch has not moved (it shud have a rubber grommet over it by the bulkhead ), also the tailgate glass needs to be closed properly as that also has a switch on it to move the glass into position after you have closed it , is it anything to do with the icy weather we are having ?? i would certainly check those first off especially the heated rear door glass to make sure its functioning properly , you can also trick it with a screwdriver to make it thinks its closed when its open . just flick the switch in the lock with a screwdriver! and then check it , best of luck .