I update to 4.4.2 yesterday and since the update my phone's wifi will not work properly. If the phone has been on for more than a few minutes without having wifi on, it will not pick up my network at all when I turn on wifi. If I leave wifi on, then reboot, it picks up network immediately upon starting up. But then a few minutes later it drops the connection and I cant get it back, even though it shows my network in the list of networks. I dont think it's a problem with my router, as I am using the wifi on my tablet to post this message. I have never rooted or hacked my phone in any way. I have just installed apps from the play store or amazon.