Node out of blue rebooting

[Pergola Fabio]

Hi,

i have an ac88u , running merlin
2 x nodes ac86u, running stock

about 2 hours ago, i changed the channel setting on main router, from 11 to auto setting
seems now 1 of my nodes 2 hours later was rebooted ... is this normal behaviour?
uptime of my mainrouter is still 23 days

is this expected? is it normal that a node reboots?

 

[Pergola Fabio]

here is also a log , it rebooted around 20:50 , i see a lot of dhcp requests at that time from that specifc router??

Sep 1 20:44:24 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:44:57 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:44:57 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:45:29 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:45:29 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:46:01 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:46:01 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:46:34 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:46:34 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:47:06 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.69 00:22:6c:14:cd:5c
Sep 1 20:47:06 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.69 00:22:6c:14:cd:5c Luidspeker
Sep 1 20:47:06 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:47:06 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:47:39 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:47:39 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:48:11 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:48:11 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:48:43 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:48:43 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:49:16 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:49:16 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:49:48 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:49:48 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:50:20 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:50:20 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:50:53 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:50:53 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:51:25 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:51:25 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:51:44 syslog: wlceventd_proc_event(527): eth1: Auth 7CD:90:CC:EC:23, status: Successful (0), rssi:0
Sep 1 20:51:45 syslog: wlceventd_proc_event(556): eth1: Assoc 7CD:90:CC:EC:23, status: Successful (0), rssi:0
Sep 1 20:52:21 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.197 26:67:a5:f5:96:97
Sep 1 20:52:21 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.197 26:67:a5:f5:96:97 OnePlus-6T
Sep 1 20:52:23 kernel: device br0 entered promiscuous mode
Sep 1 20:52:26 dnsmasq-dhcp[29599]: DHCPDISCOVER(br0) 84:c0:ef:25:77:42
Sep 1 20:52:26 dnsmasq-dhcp[29599]: DHCPOFFER(br0) 192.168.0.60 84:c0:ef:25:77:42
Sep 1 20:52:26 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.60 84:c0:ef:25:77:42
Sep 1 20:52:26 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.60 84:c0:ef:25:77:42 samsung_1
Sep 1 20:52:31 kernel: device br0 left promiscuous mode
Sep 1 20:52:31 kernel: device br0 entered promiscuous mode
Sep 1 20:52:40 dnsmasq-dhcp[29599]: DHCPDISCOVER(br0) 0c:9d:92:46:4e:a0
Sep 1 20:52:40 dnsmasq-dhcp[29599]: DHCPOFFER(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:52:40 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:52:40 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:52:48 dnsmasq-dhcp[29599]: DHCPREQUEST(br0) 192.168.0.3 0c:9d:92:46:4e:a0
Sep 1 20:52:48 dnsmasq-dhcp[29599]: DHCPACK(br0) 192.168.0.3 0c:9d:92:46:4e:a0 rt-ac-86u2
Sep 1 20:53:33 kernel: device br0 left promiscuous mode
Sep 1 20:54:29 syslog: wlceventd_proc_event(491): eth2: Deauth_ind 7C9:5C:7A:A5:E4, status: 0, reason: Deauthenticated because sending station is leaving (or has left) IBSS or ESS (3), rssi:0
Sep 1 20:54:29 syslog: wlceventd_proc_event(508): eth2: Disassoc 7C9:5C:7A:A5:E4, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8), rssi:0