I was seeing the same error with eap='2' and the root cause ended up being a problem with the wired network connection. HVAC repair people managed to cause problems with the cable connected to the AP. The big clue I ran into was the fact that the switch port it was connected to was not connected at 1000FDx, and I was seeing Excessive CRC/alignment errors on the port. That was my reminder to check everything and assume nothing...
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