MacBook Core 2 Duo reboots upon sleep (closing lid)

I've had my new MacBook for over a month. Recently it began restarting when the screen is closed. Very annoying problem. There is no warning, my entire system just reboots. Seems like this only occurred after 10.4.9.
If anyone else is having this problem, please let me know.

Same thing here... When I close the lid the apple on the cover flash and then I ear the booting cheer, if I open the lid and I see the start screen. It happen to me about 20-25 times and only since about a month (with a c2d macbook, 7 months old).
Hope Apple will fix this. I don't want to send it in for repair cause it really seems like a software glitch.
C2D Macbook 2ghz, 1gb RAM, 80gb HD   Mac OS X (10.4.8)   20gb iPod

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