The wifi keeps turning off and will not let me turn it back on. After restarting, it will work again for a time, but the problem returns. I reset the SMC and PRAM, but the issue remains. Wondering if anyone has another solution before trying to replace the cable and/or board.
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Have you tried running the onboard diagnostics to see if something pops?
Restart your system and press the D key some versions of system firmware breaks the diagnostics so it might not work.
Reference: Mac startup key combinations
If it fails you really have no choice than to try reseating the cable following this guide MacBook Pro 15インチ Unibody Mid 2012 AirPort/Bluetoothケーブルの交換
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