It isn't backing off (anti finger pinch) - that is horribly obvious when it happens.
... it certainly looks like it's forgotten where the limit stop is, as suggested by pikpilot it would benefit from a reset.
I've never had to do that on any of my skodas, but all the Fords + BMWs I've had over the years have often needed it done ... usually related to the frequency of use, my last Mondeo had to be reset most months.
On both of those marques, you open the window fully holding the button and keep holding it down for a slow 3-elephant count once fully open, then close by holding the switch again to force past any fake stops, and then hold in the closed position for another 3-elephants. It should then work as a one-touch again