Macbook pro 15 inch wifi problem (late 2011)

Hello,
Here I write a little desperate with this problem that I have on the MacBook Pro (late 2011) with WIFI .
For several months ago, when I power on the MBP is all apparently normal , spend a few minutes and I lose the WIFI , the icon still comes out as "connected " but no WIRELESS signal , I turned off the WIFI, but, when I try to change back to turn ON, the icon of WIFI still OFF ( the inverted triangle ) . Restarting the MBP and still the problem no signal and appears as disabled , delete PRAM several times until finally everything works again , spend some time and again the same thing sometimes is fine for several hours, go out to eat and return and again the same thing, the worst was when I saw the message "Hardware not found" and "X " where the icon goes WIFI . I rebooted several times and not managed , this was the "hardware not found" message. Some time ago I went something like , when Lion had and read that resetting the PRAM and managed , never came out , but now even that it manages , and it is becoming more common , I thought it was the OS ( MacOSX Mavericks ) so I reinstalled (I'm not used Time Machine, I install all again ), this work the lasted several days without fail, until she passed again, I'm out of WiFi, when I see no WIFI signal in the list , restart me WIFI goes off and I can not change , restart it goes back to " hardware not found" and so on.
Now desperate for this, I opened the MBP , disconnected the cables from the Airport card and reconnected with care and making sure you are all well , turned on the MBP again and works!!, I lasted two weeks , then I thought it was that. But again the whole problem again.
Already investigating more online and I found some details from other users
1 / Both WIFI and Bluetooth are on the same card ( the q disconnected and reconnected )
2 / If the card was wrong , losing the WIFI Bluetooth should lose , but I tried Bluetooth and has no problems
3 / Reported that resetting PRAM or SMC but still, in my case, does not work.
Now all I have left to rule is the WIFI antenna that is located ( if I remember correctly ) for the bottom of the screen, and according to several users this tends to fail from constant use to close or open the MBP (or either to cover or uncover ) , and sometimes it just heats and heats close to this area .
Has anyone had a similar problem? My MBP turns 2 only on March 7, 2014 , I can not believe all that cost me and now is about to fail , I have a Sony VAIO Core 2 Duo for about 5 years (or more) ago and is still running and has been dropped many times and nothing has ever happened : (
Additional data on my MBP ,
Several months ago ( long before the problem with the WIFI) I changed the hard drive for an SSD ( 250GB Corsair Neutron X ) .
There is a problem that often makes me too, is that when you close the MBP ( to open ) , and open it back again ( out of sleep) the following happens :
1 / It instantly freezes when waking from sleep and I have a long wait to enter the password.
2 / When you leave idle normal let me put the password, but just when giving ENTER freezes
3 / Out of sleep, let me put the key, ENTER and when I load the desktop freezes
Another problem :
This only happened to me a few times , as I mentioned , my MBP is formatted ( have Mavericks ) before formatted (clean install without time machine) , I closed the MBP ( I sent to sleep) and the open the screen was black , but as with bright, and not leave the state, turned off force ( pressing the button) , start the MBP again (power on) charged normal gray screen with apple but with a fairly low brightness, spent a few seconds and turned the brightness to normal and started normally .
I hope some can help me with these problems.
PD : I'm from Peru , if anyone knows a trusted service that please let me know .
Thank you very much .

Your wifi problem sounds very much like the problem I had. The wifi would drop out, the icon showed it was still connected. If I turned it off, I couldn't turn it back on. Another user here pointed me to the problem, which was the wifi cable (the flat cable goint from the card to the motherboard). I found it on ebay for $13 and it's been running fine since I replaced it. This is the repair guide for your machine. The part number will be on there if you click the link.
http://www.ifixit.com/Guide/MacBook+Pro+15-Inch+Unibody+Late+2011+AirPort-Blueto oth+Cable+Replacement/7510

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Soldering irons have been around for over 4,000 years. Up until the late 1800s they were all heated by open flame or burning coals.
1894
The American Electrical Heater Company of Detroit Michigan begins manufacturing electric soldering irons. Shortly after the American Beauty® line of soldering irons appears.
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1926
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1946
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1949
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1951
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1954
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1960
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1967
Weller begins manufacturing it's W-TCP soldering station with a "Magnastat" iron.
1970
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Reference: http://www.stevenjohnson.com/soldering/history.htm
So the actual fundamental concern is not soldering, soldering has been around for a while, finding a technician is not the issue. Then the issue would seem to me to be, "will a card fit"?
If the card fits, it can be soldered in. That’s the bottom line. An expert might take an hour to solder it, An expert might charge $90 - $250 an hour. A person with more than a little experience will appear as an expert to you. Ask for and check references, BBB to reduce your learning curve. Establish a maximum price, Establish criteria with your expert that make it acceptable to agree in advance in writing to only pay a fixed max amount on successful completion.
Does anyone have a reference of it being done?
Does anyone know a contact company that would take the job?
Does anyone know specific parts (have a URL?) that should or are known to work?
Milestones
– Feasibility confirmation
– Locate engineering soldering expertise
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Notes:
If Apple had Nvidia reduce or reshape the display card specifically to fit the MacBook Pro you’re out of luck however if the MBP card was not customized by Apple then any modern mobile Nvidia board may work if you can find a tech to solder it in.
If Apple changed the already small mobile card form to custom fit the MBP then you’re going to have no luck.
Glad to clear that up for everyone with some material relevant facts for the adults
shldr2thewheel wrote:
the graphics card is not upgradeable.
Kappy wrote:
You cannot upgrade the CPU or GPU on laptops. They are soldered to the motherboard.
Regardless of your being new here, this topic has been discussed before. You might have searched before posting.
Allan Eckert wrote:
If you would have read the threads posted on the right under the heading More Like This, you would have discovered that it has already been posted here.
Allan

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