Problem with sent deauth

Iam using Mikrotik RB411, we are facing frequent data loss with the connectivity. i have also attached the screenshot of the log. Can anyone here plz sort out this issue.

Regards,
Shaggy
Data Loss.JPG

please upgrade to v3.23 and check again.
Here are the descriptions of the log entries for the wireless:
http://wiki.mikrotik.com/wiki/Wireless_Debug_Logs