MAZEL TOV!
After months of of struggling with my shut down problem, I came across
this thread on Superuser.com.
1)open device manager.
2)expand network adapters.
2)update drivers for "Dell Wireless 1705 802.11b/g/n (2.4GHZ)" and "Realtek PCIe FE Family Controller Properties".
4)then open properties for "Realtek PCIe FE Family Controller Properties".
5)open "power management" and check first two boxes.
6)click OK. close device manager.
7)restart your laptop.
8)now shut down to check if your problem solved.
In trying these instructions, I realized that the Realtek PCIe FE Family Controller was disabled...I enabled and followed his instruction...Any clue how it may have been disabled?