my PS3 has never locked up... not even once. i've had it since launch. i leave it on about 12-18 hours out of the day. it's in an entertainment center... about 4 inches on either side, 6 inches in the rear, and a solid foot of air above it. it's horizontal, as when i had it standing up, it got noisy as all get up, and i could have cooked an egg on it. haha.
all of them get warm / hot, but the crashing you should look into. you have plenty of warranty left, even if you got it the same time i did. you're good for a year on that, so call up sony and talk to 'em.
the controllers are getting revamped here soon. GDC is coming up (game developer's conference), and there's a LOT of good news in the works to be 'announced'... even though we know a lot of it already, lol. what i'm trying to say is... you will have your rumble back! i'm looking forward to it too. it's actually a new technology created by immersion (those guys with the law suit... we're all friends again), and it's called touchsense. apparently it's amazing and blows the previous versions of rumble right out of the water.
ummmm, any other questions, and i would highly reccomend you head over to
PS3Forums.com. i'm a member over there with the same name. there's a lot of really helpful people, and if you have any more issues, i'm sure you'd get a lot more opinions. after all... this is an R/C website =P. but... i suppose the sixaxis could be labeled a remote control, hahaha.
anyway... GL. i hope you get everything working and your PS3 in good health.
PS: what games do you have?? i have warhawk and motorstorm for some online play. add me (Mallanaga... just like everywhere else)