@fillet
You can found a lot of cases in forum about PS3 freezing due hot days here.
"E bem, o meu PS3 já travou algumas vezes, na maioria das vezes após muitas horas de jogo, e em dias muito quentes. Se o seu PS3 fica num lugar muito fechado, mude-o. Se não der, ponha um ventilador perto dele ou jogue menos"
Translation "Well, my PS3 already crashed a few times, most often after many hours in very hot days. If you have a PS3 in a very closed place, change it. If not, put a fan near it or play less."
http://www.soniczone.com.br/forum/index.php?/topic/19150-ajuda-ajuda-com-ps3/
It is really common here to put a fan near to consoles to not have trouble with overheating... the companies design the cooling system in consoles (and all eletronics) based in Europe temperatures... not Brazil and others hot countries.
