Wireless interface drop all clients

Hello

We have one Site with 3 Wireless interface that acts as a AP, all wireless interfaces have the same configuration, except the SSID and the frequency.
Went we power up the site, all the wireless get connections around 20 clients each one, but around each 15 minutes the wlan3 drop all clients; the other interfaces still working, and 5 later the wlan3 start to get connections again.

uptime: 5h9m35s
version: “2.9.50”
free-memory: 14632kB
total-memory: 30428kB
cpu: “MIPS 4Kc V0.10”
cpu-frequency: 399MHz
cpu-load: 25
free-hdd-space: 92184kB
total-hdd-space: 126976kB
write-sect-since-reboot: 127
write-sect-total: 30651
bad-blocks: 1

Do you see this problem before?, could you suggest me which logs I have to turn on to get this fault.

Thanks

I believe it will more helpful, if you give us at least information from ‘log print’, when disconnect is present.

What are your three cards and what power supply?

Hi, as all have stated above i only add on check your connection types from your clients to your AP as well as Interferance with body mass as well as relfactive matter but most of all your logs will tell much