OpenWrt sometime 5GHz wifi disconnect

device: NETGEAR R6220
version: OpenWrt 18.06.1 r7258-5eb055306f / LuCI openwrt-18.06 branch (git-18.228.31946-f64b152)
dmesg log:
system log:

There is no evidence in the logs of any client disconnecting. I could on;y find 3 different clients successfully connecting.
What is the output of the following commands?
cat /etc/config/network; cat /etc/config/firewall; cat /etc/config/wireless ; cat /etc/config/dhcp ; ip -4 addr ; ip -4 ro ; ip -4 ru

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There is the output:

I find somthing is weird, Look at system log's time

Wed May 22 08:03:15 2019 ss-local[2412]: running from root user
Wed May 22 23:37:49 2019 cron.err crond[1062]: time disparity of 934 minutes detected

You can paste the output here as well. Just use preformated text (Ctrl+Shift+c)

These are not related to wifi.

First of all raise the distance to at least 100
option distance '5'
Then use some wifi analyzer on your phone to verify that the channels you are using don't get any interference from other wireless networks.

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OK, I will try it.

Anyway, Thank you very much.