Solved for time being..
Action taken:
1. Full Cycle Charge
2. Soft reset
3. Hard reset
4. Lastly have to reset all setting..

After I monitor, I think this problem happend when I activate my find my iphone on mobile me.. than my usage=standby time will be same..
If I off (deactivate) find my iphone in mobileme, it seems ok.. Any one experience this situation.. I already set push notification manual in find my iphone setting, but the problem still exist.. how to solved this problem and need to confirm from our sifu2 here..