After iOS8 update my iphone 5 doesn't connect the wifi properly and battery dies instantly

Hi, I have upgraded my iphone 5 to iOS 8 and after that the full 100% battery discharges instantly even if I do not use any apps.I have to charge it every 2 hours. I do not know what to do now it became unreliable.
Second issue is that I cannot connect my wifi at home in some rooms, when the other iphone 4 is connected perfectly. Sometimes I cannot even see the home network sometimes it shows me it but when I want to connect it says something like error to connect the network. It always connected before the update. I have to use LTE all the time at home now. It is crazy.I am scared to upgrade the iphone to iOS 8.1. I tried to totally reset all setting on my iphone including Network Setting, plus I have turned off background App Refresh and Lowered my brightness to save battery life, but nothing worked. And I'm afraid it's getting worse every day.
Please let me know what I can do. Because it is terrible, I have this phone for two years only and I am very careful to devices I have never dropped it and didn't do anything to make these kind of issues.
Thanks

Do the restore with out restoring from your back up if that doesn't work I would go in the the apple store.

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