Hi, I switch from old RB600 and MC9 carts to AP base on RB921GS-5HPacD r2. From that moment NanoStations M5 as clients start disconecting very regulary - every 20mins for 1minute and connect again. Signal from AP is -57 dBm and CCQ 99%, signal from client bit weeked 56-60dBm and CCQ 80-99%

Any idea what it can be?

I did try change default falue of Disconnect Timeout on wireless interface on AP from 3s to 7sec but not much different. I did changefq also but same result. Other Mikrotik based clients are fine on same AP.

7.3.2020 18:17:42 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 17:57:11 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 17:36:40 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 17:16:10 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 16:55:40 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 16:35:09 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 16:14:39 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 15:54:08 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 15:33:38 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 15:13:07 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 14:52:37 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 14:32:06 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 14:11:36 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 13:51:05 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 13:30:35 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 13:10:05 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 12:49:34 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 12:29:04 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 12:08:34 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 11:48:04 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 11:27:32 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 11:07:02 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 10:46:32 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 10:26:01 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 10:05:30 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 9:45:01 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 9:24:30 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss
7.3.2020 9:03:59 Local7 Debug IP wireless,info 55:44:33:22:11:00@wlan1: disconnected, extensive data loss

Solved. Nanostation has watchdog. Interval 300s, startup delay 300s, Failure Count To Reboot: 3 = reboot every 20minutes )). I was pinging old, not existed gateway