How to unban wireless client when I receive "wlan1: reject MAC, banned (last failure - unicast key exchange timeout)?

Hello,

I’m using RB951G-2HnD with ROS 6.45.6 and started to receive in logs almost thouthands events “wlan1: reject MAC, banned (last failure - unicast key exchange timeout)” for my wireless devices. Devices are not able to connect.
I haven’t find a place in Winbox where I can unban this devices without router reboot or wireless devices reboot as it can be hard to do when devices are not physically reachable.