CSCve15860 - CAPWAP data(client)traffic arriving before first Keepalive, keepalive was getting dropped - 1

[sajish kumar Ramakrishanan]

We have experienced the same symptom for the WLC version 8.5.135 on WLC 5520.. does anyone running the same version experienced this issue? the fix is again to reboot the AP.  

[Leo Laohoo]

You really need to stop using 8.5.13X.X.
Upgrade to 8.5.151.0 and see if it improve things.