Logs WLC *spamApTask6: %LWAPP-3-REPLAY_ERR:

[dazza007]

Model
AIR-CT5508-K9
Software Version

8.5.140.0

i have the logs below on the WLC which are concerning. 
Is this a replay attack? or something else. There is load balancing on the 4900M switch across the four ports. 

*spamApTask6:   %LWAPP-3-REPLAY_ERR: spam_lrad.c:45203 The system has received replay error on slot 0, WLAN ID 2, count 43 from AP <Base Radio MAC>
*spamApTask3:  %LWAPP-3-REPLAY_ERR: spam_lrad.c:45203 The system has received replay error on slot 1, WLAN ID 2, count 1 from AP <Base Radio MAC>
It is occuring on numberous APs on the network.

[marce1000]

Ref : https://community.cisco.com/t5/other-wireless-mobility-subjects/lwapp-3-replay-err-and-load-balancing-issue/td-p/2597120   (Kamaljeet Singh)

  LWAPP Replay Errors from multiple APs at intermittent intervals of time are expected in the WLC message logs. This is because of AES CCMP REPLAY errors in the AP console, which are also expected in large live networks.

 M.