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I've experienced a similar problem with a Thunderbolt port on a machine. Nothing that plugs into the machine would be recognized. Not even a simple USB device. Power cycling multiple times didn't fix it. But powering off and leaving the machine off for a few minutes fixed it.

Given the problem occurred only once, I didn't do any more investigation on why.

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I have an Intel NUC 8i5BEH that does this repeatedly. Pain in the backside. The best way to “fix” it that I found quickly is to unplug the NUC and short the power connector for a few seconds. :/

My problem occurred on an Intel NUC11TNK so it might be exactly the same issue as yours.

Bad electrons. Turning off the power lets them drain out.

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