Under bonnet insulation was the subject of a topic I posted months ago. I am in my third “pad”, first two replaced under warranty at service visits without question.
Happy to report that this third one is perfect after 6 months so all good.
Yes, it was suggested that it was the heat from the engine that did it. Referred to as “the heat shield that protects the bonnet from inside”.
Just badly designed I think.
Anyway, it is fixable under warranty with a new one. Def get it done by dealer.