All You need: Latest Ver. Root Explorer ( tried it with an older ver. and it doesnt work)
1.First buy the Latest Root explorer
2. Allow permission for root.
3. Go to System->USR->Keylayout
4. in the keylayout folder, mount as r/o
5. For both ffa-keypad.kl and fluid-keypad.kl open as text editor and you should find the VOLUME UP & VOLUME DOWN.
6. If you see something like WAKE or WAKE_DROP, just delete those words
7.Save and Reboot!
8. Enjoy!! No more Volume wake