My MBP is a bit less than one month old now. It's a refurb, but it came it great shape and looked completely new. So far, it has been a great machine. Just one problem with it: When I set it down after putting it to sleep, I hear it restart. It seems to happen whenever I do anything more than set it down with utmost gentleness. I can't really afford to be setting it down like that every time, and it's a bit troubling that it restarts so easily. If I'm working on something, obviously I'll lose my work each time. Any thoughts on what could be causing it?