not sure if anyone else has faced this issue.
whenever i upgrade any remote IAP from central it always seems to break the AP.
i have done couple of upgrade from HQ and the upgrade works fine.
When i say break it fails to communicate with central and the only way to bring it back is do a hard reset on the AP and then boot it up.
i do not have a console cable to find out why it failing but would love to hear if anyone else is facing similar issue.