Windows Replaced Under Warranty Re: Condensation

I was wondering if anyone has had caravan windows replaced under warranty due to condensation / misting up on the inside ( between the panels ) of the double glazed unit.

I am aware of the arguements about windows are permeable etc etc and the theory of take out the bungs and let it dry etc but has anyone had windows replaced under warranty because they could not get rid off the condensation / misting after trying the above methods?