Product: Office > PCs > Netbooks
The following applies to computers with Windows XP or Windows Vista based computers. It is important to note that this is not considered a Windows or Computer problem as the system is working as it was intended.
The computer's BIOS performs a full boot while it returns from hibernation and clears any wakeup signals that might be active. Therefore, Windows cannot determine why the computer woke up. Windows then returns to hibernation after five minutes of inactivity to avoid certain situations. For example, Windows may then return to hibernation to prevent a program from waking up the computer and causing the battery to drain while the computer is not being used.
This problem may also occur in Windows Vista. After you wake a Windows Vista-based computer from hibernation, the computer may enter hibernation again after two minutes of inactivity. For more information, click here to visit Microsoft.com Knowledge Base Article 929734.
Important: Windows Vista users that experience additional problems are encouraged to download and install the Windows hotfix available from Microsoft by following the link above.