My iPhone 4s wifi connectivity has suddenly gone loco [multiple issues]

My iPhone 4s (that I've had for just over 14mos now) has automatically tapped into my office's visitor wifi ever since we first established it in Aug2013. And then suddenly, last Friday, it dropped the connection. But that was merely the kick-off to my varied wifi troubles.
Issues I have had since--
*Greyed out Wifi switch in Settings menu [resetting network settings fixes this....but it later returns]
* the "unable to connect to XYZ Network " pop up message
*Phone is stuck forever searching for wifi networks
*once connected to a wifi network, not being able to maintain connection for more than 5min
Yes, I have tried rebooting...it sometimes helps...but ONLY TEMPORARILY. I have had these issues, in various locations since Friday [ at the office, and at the library, and at home.] Is there *ANYTHING* I can do? I am very reluctant to endanger my phone display /other components by putting it in the freezer...but yes, I've heard of that trick...haven't done it though. Besides...if the fix is some sort of trick of temperature , how long lasting could that possibly be??
HELP?? ANYONE??

I have found through research that the iPhone 4S has been manufactured with a batch of Wi-Fi chips that are prone to malfunctioning.
I am currently suffering from your problems and to add to it, my range has degenerated badly.
I fear that the problem is mainly hardware (and maybe firmware which senses chip temps) so resets and setting resets won't do much.
I have seen many people have success with superheating their iPhone's Wi-Fi chip area (on the back, the top right corner where the Wi-Fi/Bluetooth compenents reside) via a heat gun or a hair dryer. The process has no set or recommended form. Meaning if you look this "fix" up you'll get mixed procedures.
Leave iPhone on
Take heating device and heat that corner (some do it by blowing into the headphone jack)
Wait until the temperature alert ("Your device is too hot for use" or something like that)
Turn it off
Leave in the freezer or let it cool off completely.
Turn on.
I tried this to no avail, twice actually. (Maybe I'm using the wrong procedure.) If you have the time (really just 20 minutes) it could be the difference between keeping your iPhone and having to spend cash money on a new/used phone.
I have no idea what the risks are, I'm no electrical/technical engineer or whatnot, but this is all from research that has shown to help some, if not many.
Here is a quote of another solution I found, I HAVE NOT TRIED IT YET.
"FIXED = SOLUTION. My girfriend had the same problem for almost a week. Tried everything suggested on these pages and more.
I managed to FIX this by = ''Unsrewing the screw(s) on the Battery connector & disconnecting the battery for 5 minutes'' Then reconnect the battery, put the contact clip back in & screw the screw(s) back in, Powered it on, left the phone for 2 minutes to boot up fully then went in to settings and the Wi-Fi Network was there to connect to. Had a solid connection ever since."
To open your iPhone, you most likely need a pentalobe screwdriver. Just take a quick look at the two screws at the bottom. To take apart the internal components (the second solution) you'll need a precise, small Philips head (#00 or #000).
Here are some links of super quality ones on Amazon. I currently have these, they're AWESOME.
Wiha (German brand) Precision #00
http://www.amazon.com/gp/product/B000O5IM2Y
Wiha Precision Pentalobe
http://www.amazon.com/gp/product/B000O5IM2Y/http://www.amazon.com/gp/product/B00GY5WO8G
Note: There is also another "fix". This one is really hardware based. The iPhone has a screw at the top that grounds the Wi-Fi antenna to the board. If this screw does not make proper contact or if the EMI shield has been roughhoused with, Wi-Fi performance will decrease. Many have fixed their Wi-Fi problems by tightening this screw.
GOOD LUCK! Might as well try these fixes before you put money down for a new phone!

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My iPhone 4s wifi connectivity has suddenly gone loco [multiple issues]

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