My iPhone 4S was bricked by iOS7?

I upgraded to iOS7. Immediately the phone was very slow. The phone was on charge for the night, but would not power on the next AM. I did multiple resets (pressing Home and Power) and finally the phone came on. It was very erratic and required multiple reboot and resets to finally reach a point where it was kind of stable. I realized, however, that the wireless no longer worked. I took it to the Apple store where I was told that this was a hardware problem and I would need a new phone ( $199.00 please). I pointed out that the phone was doing everything correctly before the update, but the guy just smiled politely. Does anyone know what to do with this? Is there a fix?

Sounds like your phone is trying to work out "Error 21" by itself. It's an error caused my the motherboard not being properly connected. The same thing happened to my iPod, and they replaced my iPod. It is said to be not repairable, but I fixed the same problem on my iPhone 4S. Then again, I was on iOS 6 so you may have a firmware problem where the iOS potentially was not installed correctly. Tell them to replace your phone.

Yeah I agree with the comment above ^