one of our customers has a v2110 controller with AP36xx. Since the beginning of this year they have several APs where clients are not able to (re) connect to. Only a reboot of the AP helps. Than clients are able to connect again.
This behaviour happens every few weeks and under higher load sometimes several times a day.
Many APs on different locations are affected.
The traces we took from the APs prior to reboot have the following log messages in common:
Info 05/28/14 07:15:35: Can't deflect TKIP chop-chop attack--no sta!
The software version is 8.11.06.0006-1
Are there any security procedures implemente which cause this issue or is it a bug?