Tewsy

I've recently bought a three year old Skoda Octavia VRS, my first ever Skoda, and so far I'm very happy with it. It does have an issue though in that the rear passenger window won't open once the car has started moving. If you open it before pulling off it will stay open, you can put it up and down as long as you open it before the car moves and don't fully close it. However, once the window is closed if the car is moving it will not reopen. I've booked it into to the dealer in a couple of weeks time and in the meantime have spent some time searching online to see if anyone else has mentioned this fault previously but I can't seem to find anything similar. Has anyone ever encountered this or have any ideas what might be going on? The dealer is saying if the issue is found to be wiring it won't be covered under the Approved Used Warranty so just trying to find out a bit more about it and possible causes. Thanks