Dometic Polyplastic Window Problems

lisvane

Some of the windows on my motorhome have started to show signs of stress fracture or delamination.  The vehicle is four years old and I have had it since new.

The manufacturer states that this is due to pressure and/or harsh cleaning chemicals.  As I know that this is not the case and as I have seen on line that there have been issues with these windows in the past I am curious to know if any other members have
experienced similar issues with these windows recently.