It's really odd, when i set the "keep wifi on during sleep" to never and turn off the screen till the wifi is off and then turn on the screen again, it says that the wifi is off but the internet is actually working, im even not able to enable/disable the wifi setting when this occurs, i tried resetting my phone but it didnt work? is this a hardware issue? should i take it to store and ask them to fix it (still got a few weeks of my warranty left)?