Wifi & Battery Problem since upgrading to ios 8.0.2

me upgraded my iPhone 5s to iOS 8.0.2 but I have a problem about Wifi and Battery !!! my wifi disconnect every 1 minute and when i turn it Off then On it will work for 1 minute and will disconnect again and i have to turn it Off then On again ! And my battery is getting low very faster since upgrading to ios 8.0.2 while i installed just 3 Program (Line-Viber-Clash of Clans) !!! please heeeelp me

Hi there Mehrdad Nofar,
It looks like there may be a few resources for you. For the Wi-Fi issues, I would recommend taking a look at troubleshooting steps in the article below.
iOS: Troubleshooting Wi-Fi networks and connections
As far as the battery concerns, there several things you can do to isolate the cause of the issue. The page below outlines tips to maximize your battey life and isolate any background activities. 
Apple - Batteries - Maximizing Performance
Hope that helps,
-Griff W.

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