wireless disconection

Hy!
I’m having problems with disconnected clients. The log shows several wireless messages with the following error: wlan1: reject client’s mac address, baned (last failure - association not possible: invalid AKMP (43)).
Has anyone had this problem?

enable debug logs and post their full output here. also tell us if that client MAC is known and real.

Below the image mikrotik log. This Mac is a customer and not only happens with him but with several customers. When there are many mistakes the card restarts](http://img530.imageshack.us/i/imagemcl.jpg/)

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