Shutdowns during sleep are usually blue screen crash related and specifically 0x9f. Try updating the airport express router drivers as they may be the culprit if they were in the past through iTunes. If they are already up to date, re-install them using the following procedure in case they are corrupted.
- Click Start Menu
- Right Click My Computer/Computer
- Click Manage
- Click Device Manager from the list on the left
- Find the device you are trying to uninstall by expanding the appropriate set of devices
- Right click the device
- Click Uninstall (do not click OK in the dialog box that pops up after hitting Uninstall)
- Put a tick in Delete driver software for this device (if this option is available, otherwise just hit OK) and hit OK
- Restart your computer
- Install the latest driver for the device once Windows starts.
Alternatively:
- Login as an adminstrative user.
- Click Start Menu
- Click Control Panel
- Click Hardware and Sound
- Click Device Manager (the last link under Devices and Printers)
- Find the device you are trying to uninstall by expanding the appropriate set of devices
- Right click the device
- Click Uninstall (do not click OK in the dialog box that pops up after hitting Uninstall)
- Put a tick in Delete driver software for this device (if this option is available, otherwise just hit OK) and hit OK
- Restart your computer
- Install the latest driver for the device once Windows starts.
Also, please follow the
http://www.sevenforums.com/crashes-d...tructions.html instructions in case there are blue screen crashes occurring. You may not see the crashes if the system is waking from sleep most to run a scheduled task and then trying to enter back into sleep mode or crashing during the call to wake.