Navid,
Just to make sure we narrow down the issue:
- Does this happen to all the users in the area at a time or a single user
- What encryption are you using?
- How wide are your channels? (20-40-80)
- What version of Aruba OS are you running.
The quiet IE fix is mainly for users who turn on 802.11k (disabled by default)
If it says the client is sending the deauth, that means the clients is leaving or roaming away for some reason