[Hardware] MBP 13" Mid2010: Wireless card turning off when computer is moved

Hello everyone !
I have been incrementally fixing my mid-2010 (1278) 13" Macbook Pro for the past 8-9 months. I'm almost done, but sadly I can't figure out what's causing the last issue, which concerns the wireless, and I would *really* appreciate your expertise!
Background: My MBP sustained heavy damage last December. The casing was carved in and the hardware was so busted it could not power on. Apple replaced the logic board, bottom and top cases. I also replaced the hard drive and reinstalled the OS as new. I then cleared all but one of the remaining problems including a faulty left palm rest temperature sensor (fault caused by loose battery electric tape contacting with the sensor).
Symptoms: It first starts with an immediate loss of the wireless internet and network connections: all websites are unresolved. A few seconds later the list of available wifi networks in Network preferences is being reduced to the one I was last connected to while still searching for new networks. Apps requiring internet connectivity start to report, well, the lack of connectivity. A few seconds later the MBP wireless is still displayed as connected to the last known network, except that it really is not connected to anything as per pings. At this stage, going into Network Preferences show the Wifi as "Off". Pressing "Turn Wifi-On" does not do anything, turning on en1 with the terminal does not do anything either. At some point the wifi icon is updated and shows the wifi as being "Off" too.
Temporary and only fix: Restart the computer.
How to reproduce: When the laptop is lifted or moved, such as when you relocate from the desk to a couch. Having the computer on my lap triggers the issue too.
What I did so far: I assumed there could be a problem directly with my airport card, so I replaced it. The wireless was working fine up until I reproduced the steps above, triggering the same issue.
It is definitely a hardware problem, but what could be causing it now that the airport card is replaced?
Thank you very much for your help !
Regards,
Kahss

Why did you post this in the iPhone discussion? You will probably get better answers by posting in a better place.

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<Edited By Host>

There may be a hardware cause behind the symptoms you cite, so a diagnostic
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A call ahead or use their web page, to schedule an appointment, is advised.
In the US and Canada, the Genius bar at a retail Apple Store can perform
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Genius Bar - Apple Retail Store:
http://www.apple.com/retail/geniusbar/
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http://www.apple.com/retail/storelist/
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Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIsand corrosion.
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Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
and that information comes from this article:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
Thanks for being a part of the Apple Support Communities!
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Try:
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[Hardware] MBP 13" Mid2010: Wireless card turning off when computer is moved

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