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So all sorted, Fitted a napa thermostat. What a pain in the !Removed! to do... The sping clips you can't get at right, spine bolts you need multiple knuckle attachments to get at then the old thermostat didn't want to come off so pry bars hammer and screwdriver to eventually break it free. Then putting it all back together one quick release hose on the bottom of it leaking like hell....removed , wiped , reconnected an thankfully sealed. Garage floor like a swimming pool but happy to report sitting at 90 on the button and getting near 50mpg cruising in a 60 zone instead of 38mpg 🤣.

18 months? 18 years would be a more realistic expectation. My A3 was 16 years old when I sold it, and its lights were as uncrazed, unfaded and weatherproof as the day they were made, proving that Audi did know how to make them properly at one time. That the company has chosen not to any more is a mark of its declining quality standards.

My suspicion, unsupported by any facts, is that the lights on newer Audis are made from a grade of plastic that is degraded by exposure to sunlight. UV degradation of some plastics is a well known phenomenon that can be reduced by incorporating a UV stabiliser into the plastic prior to, or during, the moulding stage. It increases the cost of manufacture of course, and we know cost cutting at Audi in recent years has been widespread.

The lights shouldn’t have condensation, especially on 2024 build year. The only real way to check them is to remove. Has car had a bump or repair that you know of? I would follow up with Audi UK to see what the say. There was condensation on Audi R8 rear light clusters I found and replacement ran into thousands. If condensation, still there, take pictures as evidence. You can remove condensation with vacuum and hairdryer and similar, however core issue will still remain. Inspecting the rear lights I would be looking for any for any hairline cracks. These lights will be sealed, so something isn’t right.

You would have to search the forums to find that information.