Need help - wifi gets disconnected when it goes to sleep mode - iOS 6, iPhone 5, WPA Enterprise

Hi, I have read a lot of discussions regarding wifi gets disconnected when it goes to sleep mode on iOS 6, mainly on iPhone 5.
Here is my configuration and it just keeps disconnecting wifi connection once it goes to sleep mode
iOS 6
iPhone 5 white
Purchased on Nov 3
Work wifi config: WPA Enterprise
I tried to manual add the wifi but it did not work. I tried all except for upgrade to iOS 6.0.1. I had a call to Apple Support and the guy told me I could not trust everything i read from here (well, how dare he is!!!). But I did all I could think of, and read from here.
I am with ATT and I do not have a receiption at all at work. I have to turn it to airplane mode, and use the wifi connection. I put my iPhone 4 with iOS 5.0 side-by-side to compare. My iPhone with iOS 5.0 DOES NOT disconnect the wifi connection when it goes to sleep mode; but of course, we all know, iPhone 5 with iOS 6.0 does
Any helps would be so much appreaticated. I am considering to return the phone to apple store, and cancel my 2 yrs extended contract with ATT. I might think to get another one once they have the issue fixed. It is no point to have an expensive paper-weight at work while I can't use the celluare nor wifi connection.
Thanks again,

Hi ChrisJ4203
I have tested it at home wifi tonight. My phone and my wife's iphone (both iPhone 5 with iOS 6.0) do the same.
With cellular data on (aka airplane mode OFF) with WIFI ON
Wifi icon replaced by ATT's LTE icon once the phone was waken up from sleep mode; but within 2 secs, the wifi connection got reconnected again.
With cellular data OFF (aka airplane mode ON) with WIFI ON
WIFI icon disappeared from the top bar after both phones were waken up from sleep mode. It took a while to reconnect to the wifi network (more than 10 seconds).
On a separate note, after i rebooted my phone, i can see it does "searching" the ATT's signal, then it shows "No Service", then next second, it shows ATT with full bars and LTE icon.
My question is, i have never noticed the "No Service" showing up from my iPhone 4. The "No Service" shows up on my wife's phone too. When I first got her phone and was doing the installation, I had noticed the cell signal dropped from full bars to no service, then within few seconds, it went back up. I have not had time to test on her phone again, but it is something I will be monitoring for. I wonder if anyone has similar experience like this.
anyhow, any feedback on how to fix the wifi got disconnected while in sleep mode would be very helpful.
thanks,

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Attachments:
PowerHibernateNever.jpg ‏59 KB

Need help - wifi gets disconnected when it goes to sleep mode - iOS 6, iPhone 5, WPA Enterprise

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