After Service, Airport card stops working randomly on macbook pro 17" early 2009

Hi,
So after the last time my computer was serviced, the airport card stops working randomly on moving the screen.
Upons restarting the computer, it sometimes says wi-fi hardware not installed. Then, if I move my machine around,
lift it up, turn it around, place it back on the table and restart it, it works again. I don't understand this.
And all this started happening the moment my warranty ran out. Extremely frustrating!!

It may be possible that one of the following may be the issue:
The internal AirPort Extreme card is not seated properly.
The internal Wi-Fi antenna connector is not seated properly in the AirPort Extreme card.
The internal AirPort Extreme card's connector is faulty or damaged.
The internal AirPort Extreme card is faulty.
To get an idea on how the Extreme card is installed, please check out the following iFixit article.

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