I've been having this problem snce month 1. I've tried everything, and the problem persists. Here's a list of things I've noticed about the problem. Many of these may be just my machine, so bare with e.
1. It SHUTS DOWN... it's not crashing, it's just shutting down, as made appearent by the fact thing it never offers a disk check or safe mode when you start it bact up. It -looks- like a crash (Suddenly powers gone), but I don't think it is.
2. It may not be as random as it may seem. It happens for me when I'm doing anything moderately process intensive, such as running certain games, and applications. Happens while playing WOW, while burning DVD's, even while running a windows slide show. Happens quite often when streaming video (Not so much with music), and has happend while vid's through media player. Oddly enough, I don't think it's ever done so while running Photoshop.
3. I initiall suspected an overheating problem (Which was a problem with another laptop had) so I purchased an external usb cooling pad (Fans and a usb hub in one), and it does wonders for the Acer (My old laptop) but nothing changes when I run it on my dell.
4. I've installed a second OS on the system (Dual boot), and expereinced the same problem while installing an MMOG. HOWEVER in ubuntu (The Linux OS I installed) the shutdown is much more apearent. It slips into shutdown mode, with the nice umbuntu screen as it's nice to the machine as it puts it to sleep. The weirdness however, is that the 3rd time it did -this-, it killed my boot loader.
This is a very intriguing problem, and I'd be inerested to see what different methods of trouble shooting turn up. For example, I'm wondering if blowing out the dell install of windows and installing from scratch will do. Also, what happens if you install a whole new hard drive. Mine is the core2 Duo 2ghz processor which is an upgrade I insisted on when I purchased it. Is this the same as any others experiencing this problem?