IdeaPad U400 shuts down when in sleep mode

My IdeaPad U400 shuts down when sleeping. All programs terminate.
I reviewed another poster's complaint about a similar problem several months. The response instructed the user to update the computer's drivers.
I have updated my drivers. My computer still shuts down regularly while sleeping. Please help!

Hi RuthAnne,
Welcome to Lenovo Community Forums!
I’m sorry to hear that the issue still persists even after re-installing the drivers as suggested in the previous posts, I also assume that you have updated the Video Driver(Win 7 or Win 8) & Chipset Driver (Win 7 or Win 8)specifically and checked if this resolves the issue.
If the issue is same even after installing the above mentioned drivers, please backup the Data in the computer to any external hard drive and perform OSRI (Operating System Re-Install) to check and confirm the issue is with the
OS (Operating System).
NOTE: If the computer is shipped with pre-installed operating System OSRI can be performed using the instructions in U400 User Guide click here, check the steps to perform OKR(One Key Recovery) on page 23.
Hope this helps!!!
Best Regards
Shiva Kumar
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