My Wi-Fi is greyed out in my iPhone 4s?

Since the ios 7.0.6 update, my phone has been having Wi-Fi issues. I tried all the solutions and fixes listed on apple's website, but none of them work.
i tried "cooling down" my phone by not using it for a really long time, by placing it next to a frozen packet of nuts, etc, etc.
my Wi-Fi starts working after i cool dowm the phone, so this issue is clearly caused by overheating.
this overheating problem started only after the update, so my question is, will restoring the phone back to factory settings solve the problem?

It's probably a network issue.

First try restoring the network setting by going to setting>general>reset then click reset network settings. If it doesn't work then restore your phone. Same process except you click erase all content and settings.

If it still doesn't work its likely a hardware issue.

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