I'll just go ask the guy on McLaren Life. He's a McLaren GT driver and has just about every car under the sun. If he confirms McLarens have problems overheating on the track, I'll gladly take what you say as true.

As of now, you're the only one saying it and it's the first I heard of it.

I'd point out that cooking the brakes isn't necessarily indicative of a brake problem. It could very well just be someone who has to use the brakes way more than would normally be necessary.