Hi,

I installed the Windows 8.1 Preview on my Windows 8 laptop, but there is a very annoying bug. Once my laptop goes into screen saver mode, sometimes my laptop will freeze and won't allow me to do anything (log back in to the computer). Anyone knows how to fix?

Disable USB powersaving

Hi,

Please unplug all the unnecessary devices to have a check.

You can also try the methods in the Knowledge Base article:

Troubleshoot problems waking computer from sleep mode

http://support.microsoft.com/kb/266283

Regards,