freelander td4 rear window

hi i have a freelander td4 and the rear window goes down on its own. it happens when the car is running and when the car is parked up. i have tried to recalabrate it, it calabrated fine 1st time but the next day it came down. now it will come down down a few times in 1 journey. i have looked through some old threads but none are the same problem that ive found. any ideas would be greatly appreciated.
thanks adam

Is your battery ok? If voltage drops I have experienced the window going down. Also I seem to remember on my last one (2.0D) if I used the spate key to close it or it might have been not using the remote but using the key on drivers door.