No connection to Wifi after upgrade to iOS 7.1 AND poor battery life

Hi,
after upgrading my iPhone 4s to iOS to 7.1, I cannot connect to any Wifi anymore. Does anybody have an idea how to solve this issue?
Additional, I am wondering why battery life is much worse after the upgrade. I closed all apps via multitasking view. Nevertheless, battery is empty within a couple of hours. (before the upgrade, it lasted approx one day!!!)
Any help is highly appreciated!
Thanks!

After every iOS update there are reports of users experiencing faster than normal battery drain. Most find that basic troubleshooting from the User's Guide resolves the issue.
Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new).
I am not having issues with battery drain on my device, it was at 50% around 2PM today, removed off the charger at 6:30AM and I'm a fairly heavy user of the device.

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http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
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http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
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No connection to Wifi after upgrade to iOS 7.1 AND poor battery life

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