Just discovered my tailgate not locking from the remote & has to be done manually.
Found out purely by chance as well, after unlocking the car to get an item out of the boot, I closed the tailgate & pressed the key - everything made all the right noises.
But for some really strange reason I felt I had to check the handle to make sure - and it was still unlocked.
Until I can get around to fixing it, I either lock it manually or leave it against an immoveable object.
How long it had been like this for, who knows? It may have been like this since the day I bought it, after all, you hear the mechanism clunking (as usual) so assume everything is OK.
I would advise all dobby owners to periodically test their tailgate is locking just to be on the safe side.