unicast key exchange timeout

Is there anyway to fix this “disconnected, unicast key exchange timeout” problem I have on a ton of ap’s?

Any AP can do it. And depending on some random circumstance, when I reboot an AP, different AP’s that connect to that one will have the problem.

I’ve seen other people with this problem and the dates on their posts were mostly 2007 and 2008.

Was the problem fixed? Or is everyone just ignoring it? Or is everyone not using any encryption at all?

My hardware firmware is upgraded, and the routeros on the ap’s is also upgraded.