Hi! I'm not sure what your talking about "Constantly causing the quick data drain"???
What kind of strange things is windows up date doing??
You might try this for the sleep mode problem.
1. Go to Start, type Device Manager and then press Enter
2. Expand Network adapters
3. Right click a network adapter and then click Properties.
4. Click Power Management
5. Make sure the box, Allow this device to wake the computer is NOT TICKED.