Grrrr, I will never understand #$^&^! computers. Was writing a reply & an error occurred - it rebooted. Came on & I saw I was still logged in so I produced a detailed reply. "Sent" it only to be told that I was not logged in!!!!!

Mick, Welcome to the forum - I trust your time here will e beneficial to you. I trust someone will have the answer you're seeking.

I'd guess your windows are Dometic - there may be something on their website. They do craze from time to time (my kitchen one at the rear is showing signs but so far no cracking. My boot lid is either fibreglass or plastic & "touch wood", it's still intact. Are there any signs as to why they have cracked eg, been hit by stones, etc from either your car or someone else's?

Have a look at the "Search" TAB (above) - you may find something there.