MacBook overheating

Apple forums display a lot of testimonies about MacBook unexpectedly and brutally shutting off.
François sent us some information too.

I explained what problem I'd met and was immediately confirmed it was a documented issue, concerning a small series only, so a few serial numbers were unofficially registered while they're trying to deal with this problem.
The 10.4.7 update actually contained a patch to address this issue yet changed nothing...
I must therefore go to the nearest Apple certified dealer where a logic board change will be done, as it's the only way they found out to deal with this... (with no certainty he admitted), that's why until the problem ain't internally solved by Apple, there'll be no official communication about it...

Thank you for sending us your serial numbers if you face this issue, so we might try and find out which machines are concerned.