MacBook (Black) Airport card fail to detect and enable after wake

I have had problems with my internal Airport card, I was having problems when the macbook started with not airport card detection, card overheating after using, this happened randomly.
After a apple certificated distribuitor test (for warranty) they found that it was only the airport card, they changed. After that, I have less issues with airport, but I still have the problem that the airport card doesn't work (disabled) after wake from suspended mode.
Is it a software or hardware issue?
Any idea, suggestion or fix?
I really desappointed with mac performance/quality after these issues.

Hello,
I guess I'm having same issue like yours, but my card somehow start to work when I turn airport off then on again. Once macbook awake from sleep or suspended mode, the WIFI signal would shown in "weak" status, then turn "strong" suddenly, but the actual connection is very unstable. I need to turn off the card then on again every time to solve the problem. I tried SMC reset or other method, but the problem still remain...

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