Iphone 4S wifi issues 7.0.4

hey guys
IPHONE 4S - Help needed
first post on here as im at the end of my tether with this phone. So after installing IOS 7.0.3 i had no issues untill about 2 weeks in wifi started dropping out intermitently, at home, and office. i took no notice.
once i actually needed to use the Wifi about a week later is when i noticed Wifi was off and i couldnt connect.
so after forgetting the home network and trying to re-connect i kept getting 'Unable to connect' or the network purely wouldnt show.
so i wiped the phone to backup > issue didnt fix
i secondly wiped the phone to fresh > issue didnt fix...
IOS 7.0.4 released > Install to backup > issue didnt fix
booked into genuis bar ...
they performed diagnostics > all clear
they wiped phone to IOS 7.0.4 > Hey presto , worked like a treat .... but wait
now 2 days later (sunday , phone got fixed on friday)
Issue returned. Thought maybe the music or pictures or apps i reinstalled off the mac were corrupt and brought the issue back (unlikely)
another fresh install to IOS 7.0.4 (this time, new playlist and no pics for the phone)
Minimal apps reinstalled
(ISSUE NOT FIXED) !!!!
im getting so annoyed. the Home network keeps coming and going....
anyone got any ideas. (i know its not the broadband as i have many other things hooked up to it and all work perfect, i.e. Tv, Mac, Ipad, Apple TV etc)

ChrisJ4203, thanks very much for your input. I don't mean to turn this post into an endless debate, but frankly I am still having a hard time believing that the WiFi died as a result of a hardware failure.
My logic might be flawed, but here it is:
While the iPhone 4S got very hot when wirelessly downloading and installing iOS 7.0.4 over the WiFi network, the WiFi chip and antenna had to be functional to complete the wireless iOS update. Apple was very clear that iOS 7.0.4 is too large to download and install via cellular service. Accordingly it would appear that any hardware failure had to occur in the few minutes between the download/installation of iOS 7.0.4 and its first use. That window of opportunity is incredibly small in an otherwise flawless hardware performance. I am not a big believer in long shot coincidences, so a WiFi hardware malfunction seems highly improbable to me, but not impossible. A firmware/iOS conflict still seems more plausible to me.
I also don't read much into Apple's "out-of-warranty" replacement offer at $199. AT&T tells me that anyone walking in off the street (with or without a hardware or iOS malfunction) would receive the same offer.
I appreciate that some iPhone 4S users did not experience any WiFi issues when they updated to iOS 7.0.4, but such difference could easily be explained if Apple used more than one WiFi chip and/or firmware in the iPhone 4S series. Such an explanation would also account for iOS 7.0.4 (and 7.0.6) not recognizing the WiFi chip after the iOS update.
Still perplexed, but thanks again for your kind efforts to help.
Wonder if I can limp along long enough to spend my money on an Apple iPhone 6 ... but then again I don't want to be anyone's beta-tester.
I am tempted to switch to a Samsung Galaxy or some other smartphone as long as I will be buying new accessories, but frankly I don't want to waste my time learning a new OS or core apps.

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Message was edited by: Jacksoncao

Hi
As your probably aware this is a large problem with most 4 users at the moment you could try some of these quick tips may help?
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Try holding down the Home button and the Sleep/Wake button until your device restarts.
Turn your router off for 30 seconds and then switch it on again.
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