IPhone 4s won't connect to Wi-Fi

My iPhone 4s is having Wi-Fi problems where it takes a very long time to find Wi-Fi networks, sometimes it doesn't even find them. Then I connect to them and it just drops, and removes that Wi-Fi network from my iphone so I have to wait to find it again. The Apple genius at the store said I had to fresh restore it, which I did, and it still didn't work. It is running the iPhone 6.1.2 OS. If anyone knows how to fix this Please help me, it is unbelievably annoying.

Just take it to the Genius Bar. They will fix everything! I wouldn't wanna try and fix it myself and accidentally break it even worse. Try restarting or re-booting your phone and turn off the Wi-Fi and switch back.

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