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... ... View more