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My wifi has greyed out and I have gotten it repaired it worked fine for about a month but greyed out again for no reason and then the WiFi will come back for a few hours and gray out again I tried to get it repaired again but they don’t know what caused this could you guys help me?

This is usually caused by a faulty Wi-Fi IC Do you know if they replaced it? If they didn’t replace it and just tried to re-flow it with hot air the problem will usually come back. If the phone has ever been dropped it can cause a crack in one of the solder pads under the Wi-Fi IC which then becomes oxidised.