Espace Windows keep failing

I have only had my Espace for 9 months and in that time three window mechanisms have failed - on three diffferent windows. The first was on the front passenger door, then a rear passenger door and now the other prear passenger door - this time the car was parked but the next day the window had dropped - Renault have quoted another 350euros for a new mechanism. The car is 2008 but has only done 23,000 miles since new so why does this keep happening? - Is it common problem? And is there anything I can do about it apart from keep spending out? Now I am waiting in trepidation for the last one to fail as well!!!!