Wireless disconnecion

Hi
I have installed RB921GS 5GHZ as AP Bridge in NV2 mode , and about 20 LDF5 as clients , signals are all fine , bandwidth and CCQ are fine also , but an annoying message keeps showing up every now and then , it says : disconnected control frame time out
and reconnects again , some clients do not feel that disconnection , but others do
Anyone have an idea of the reason of this disconnection and how to solve it
Thanks in advance

Anyone have an idea of the reason of this disconnection
Yes, you need help for discover what you do not have set or have set wrongly

and how to solve it
Pay someone to help you, or provide the configuration on both side for see if something is wrong on configuration side.

It is also possible that 5GHz in your area is disturbed by people who improvise themselves as installers
and turn on antennas on public space without respect for others and perhaps without a license.

Scan what SSIDs are “flying aroud” and you will notice how WiFi bands are crowded.