I've had a black MacBook since launch without any problems. Are you using BootCamp by any chance? There have been some known funky issues with booting into Windows and then booting into OS X (this is not the case if you're using Parallels).
i just switch over to windows when i need to use a windows applications, yet i just recently noticed that issue. i have yet to use the notebook on a daily basis, which i hope to do within the next few days.
Switching to Windows and back may alter the clock by whatever timezone difference you have. You can fix this by synching with an Internet time server upon startup.
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