if the ram was faulty, don't you think we would have noticed some caching problems when we first got the laptop, you have to remember we've had it for 3 months.
Hi manawell - What's you're operating system please?
Does it turn off completely or keep rebooting? Are you by chance doing the same thing when this happens or different things? What's the make and mogel# of your laptop?
It is very likely that your laptop is overheating. How often does it turn itself off? When it turns off do you have to wait a minute or so before it will turn back on? Is it hot to the touch by the time it shuts off?