morning
a lot of mk5 golfs have a facility to open or close the electric windows from the remore keyfob
if you accidently leave a window open on your car and get out the car ,
when you go to lock the car press and hold the remote lock button , this should lock the car then close the window , once the window is closed release the button
now if you press and hold the unlock button the car will re open the window you have just closed
the car remembers the last operation of the windows and that is the one, or ones it will operate
the open facility is good for leaving a dog in the car on a hot day for example , and the close one is nice and handy , now and then , like in a car park
so the moral of the story is , your windows left sitting open, may have inatvertantly been caused by operator error ,( sorry to be so blunt ) the fact that the key fob may have been accidently pressed and held pressed for a few seconds , while in range of the car , is the most likley cause of your fault
which is why the windows have all went down ( the last remembered operation ).. it might be to many things in a pocket which has pressed the key by mistake
it would only take 2 mins to see if your car has this facility , which i recon it has , by your description of the fault
and all you need to do for the future is make shure that the key does not get pressed while in range of the car accidently
a final point , is to make sure the remote buttons are not sticking , and your remote is working ok , a sticky button could do the same thing , worth a check
if your car has this facility , you know know how to avoid it happening in the future
let us know how you get on
Robert