Why does my iPhone 4S WiFi keeps shutting off?

This is the SECOND black iPhone 4S with problems with WiFi once the IOS 8 updated is downloaded.  So frustrating!
Just after the IOS 8 update was available, I updated my black iPhone 4S.  Soon after, I experienced a hot battery, screen freezes, and the screen toggle button for WiFi was grayed out.  I called Apple support and they tried to help me.  Very pleasant!  After about 30 minutes, we concluded to reset the phone back to the original factory settings.  This fix did not work and the Apple tech told me about purchasing a new replacement phone.  Mind you, the 4S was less than two years old.  Not long after, I went into my cellular carrier and they agreed to provide me with a new Apple iPhone 4S.  The new one worked just fine for several months.  Now, that 4S has begun freezing up, and the WiFi screen toggle is again grayed.  Again, so frustrating!
I am mentioning the BLACK 4S only because my wife has the white 4S and it has not experienced any issues, even with the IOS 8 updates.
I need help please!  This cannot be a coincidence that two separate black 4S phones each have an issue with the WiFi toggle.
Thank you,
Mike

No. This is a user forum. Apple does not participate here.

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