are you getting disconnection then unable to to connect back ? Is your Wifi on/off option greyed out?
Few things you can try before bringing down to apple service for exchange:
1) Reset the network settings (Note that this will clear all existing wifi network)
2) Reset and delete all content that will reset the phone to ground zero.
2#sozai29
i tried bro , even i upgraded to 6.0.1 it was still the same . some more the latest version battery life really goes down damn fast . i need to recharge my phone 2 to 3 times per day.