Iphone 4 running on IOS 5.1.1 is not detecting any WIFI

Hi all,
It's my first time here so sorry if i"m not in the right place.
My Iphone is not connecting to any WIFI networks anymore. It happenend overnight. The little grey circle is turning and turning and won't find anything.
Thanks if you can help.

here is what I'm trying
restore all settings. So the Iphoen reboots completly. It is asking if I want a new steup from an Icloud Backup, i say yes, and it can find any network!
And i don't want to start as a new phone and loose evything
Could you please help?
thanks a lot

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