I found the formula to the Wifi turns off while in sleep mode.
This trick will further improve the battery life if you don't use mobile data network like me.
Step 1: Turn off the mobile data network;
Step 2: Turn off 'Network notification' and on the 'Keep Wi-fi on during sleep', set it to 'Never' or 'Only when Plugged in';
Step 3: The most important step to the step 2 work! On the 'Location Services' menu, turn off the 'Use wireless networks'
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