IPhone 5 wifi symbol greyed out/wifi will not stay connect?

I had an iphone 5 that was having some battery issues, so I took it in and they replaced it with a new 5 (16 gig). I restored my backup, and when the restore was done, I couldn't turn on the wifi. The pull up setting was blacked out and in settings I couldn't move the switch to 'on'. I rebooted the phone, and that fixed the problem for a little bit. Eventually my wifi connection would either disconnect and quickly reconnect or just turn off all together. This can't be a wifi issue, since my ipad and my families apple devices are working fine. I've tried deleting my phone and using it as a new one, reseting the network settings (multiple times) and almost everything I can think of. This has been going on for a few weeks, and every time the wifi cuts out I have to either reboot the phone multiple times, or, if I get lucky, just turn it off and then on again. Its getting annoying and I don't know how to fix it without switching to a new, non apple device, which I really don't want to do. Any advice?  (i have the newest software btw, updating changed nothing)

Hello emconway,
Check against the article below with the troubleshooting that you have done. You also said that you had your iPhone replaced and it still has at least a 90 day warranty on it if it was serviced by Apple, so you may need to take it back to have it looked it.
iOS: Wi-Fi settings grayed out or dim
http://support.apple.com/kb/ts1559
Regards,
-Norm G.

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