Doesn't happen with desktop, rarely happened with laptop and always was a program that used max cpu. Poser is one such program that uses max cpu time. Try turning off all your power saver settings. On laptops, the operating system tends to default to power saver issues. Keep this in mind... 1. if you check your OS version number you'll find its different from desktop numbers. 2. You'll probably find that the manufacturer of your laptop has some hybernation or failsafe built in that shuts down when overloaded. Poser at max cpu can do that. 3. Most laptops are ram deficient and you should make sure you have a large swap file or page file. I've never been convinced that laptops function anywhere near the capability of a desktop. I don't use my laptop for anything other than surfing or text. No graphics. Yeah, I have P4 and Bryce 5 and PS loaded for road trips but I'm almost always disappointed and