Self-lowering rear window

My Freelander 1 (TD4 5-door) occasionally (perhaps 6 or 7 times in 4 years of ownership) lowers itself while the car is parked. IIRC it has always been overnight, usually in my own driveway but once in my work car park (at work for several days, don't ask) and most recently, parked on the street overnight.
Nothing has ever been taken from the car, or placed there.
Any suggestions on the likely cause? I expect to have the odd problem with a 13 year old car, even one as tough as the Freelander has been; it would be nice to know what to fix!

As an extra factor, possibly related... twice in the last year or so, the rear window has fully returned to the top (closed) position while the tailgate has been open. Looking at other rear window threads, I think I am lucky not to have broken the window while closing it.

You have sat on the keys.
If you hold the button down, it drops down like that.

Design feature

The boot handle lock being turned will put the rear window down. If the lock wiring gets damp, it could conceivably allow enough current to flow, tricking the CCU onto putting the window down.
My current TD4 has done this, but just once while in my possession.

Try changing the key fob battery.

Or something around your vehicle is operating at the same frequency as your fob

brownie55 said:

Try changing the key fob battery.

Click to expand...

I can't see the relevance of the battery condition in the fob.

freelance said:

Or something around your vehicle is operating at the same frequency as your fob

Click to expand...

They're all the on same frequency. The coded data stream transmitted has millions of possible variations, so getting another near by is unlikely.

I had a problem where the rear door would open when the ignition was switched on. I thought it was caused by damp as the weather was crap at the time. I sprayed wd40 on all the electrics inside the rear door but to no avail. Someone told me to change the key fob battery, and, like Nodge I couldn’t see the relevance in changing it, but it worked.
Prior to the door problem, I had the same problem as Exile, with the rear window lowering on a few occasions when parked overnight. It hasn’t happened since changing the fob battery.
Exile, welcome to Landyzone and good luck with your problem.

I don't know about the window going down but the window going back up as you close the door is likely the lock mechanism. I had one that I had to hold the handle up while closing the door until I replaced the mechanism.
Dodgy boot door mechanisms are a very common problem as the microswitches inside them fail or become intermittent after time.

Four years ownership and this is your first post. You're either VERY lucky, very handy with the spanners or you've spent a fortune in a garage.
Welcome to the madhouse.