Wi-Fi on my iPhone keeps leaving

I have a iPhone 4S ( iOS 6.1.3 ) sprint and my Wi-Fi just randomly leaves and comes back a couple minutes later, it's really annoying. I tried resetting my network settings and doing a service update and my Wi-Fi hasn't got any better. Does this happen to everyone else or is it just me. Also how do I fix this?

It happens on my iPod too

I know you are not going to like this answer, but here goes anyway. Take off your protector or case if you have one.

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