Hi, From experience, it's a bad cable/connector/connection. The switch sense that the device at the other end need power, so it's sending power to it (That for the lightning). But when it's come to establish Layer 1 connectivity, it's fail. The switch is not able to detect the speed of that the other end is able to handle. Replace patch cable at the switch, the one at the AP first. Change connector at both end of the inwall cable if changing the patch panel didn't help. Test the cable with a proper cable tester (Fluke DTX1800 or that kind of testset) before gooing further (or do it right from the begining, I may also be wrong) and replacing the complete inwall cable. keep us posted.
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