after some minutes from disconnection, the router is reconnected

I don’t understand why

Mon Mar 30 18:47:37 2020 daemon.info dnsmasq-dhcp[2206]: DHCPINFORM(br-lan) 192.168.8.7 c4:9d:ed:18:bd:8d
Mon Mar 30 18:47:37 2020 daemon.info dnsmasq-dhcp[2206]: DHCPACK(br-lan) 192.168.8.7 c4:9d:ed:18:bd:8d TP00671632
Mon Mar 30 18:47:38 2020 daemon.warn odhcpd[1566]: DHCPV6 SOLICIT IA_NA from 000300012017429d4863 on br-lan: ok fdfd:bcc6:7d3c:10::3/128
Mon Mar 30 18:48:10 2020 user.info : [ 162]: gl-sdk>> (FCGI) new session init…
Mon Mar 30 18:49:32 2020 daemon.warn odhcpd[1566]: DHCPV6 SOLICIT IA_NA from 000300012017429d4863 on br-lan: ok fdfd:bcc6:7d3c:10::3/128
Mon Mar 30 18:51:04 2020 daemon.notice hostapd: wlan0: AP-STA-DISCONNECTED c4:9d:ed:18:bd:8d
Mon Mar 30 18:51:21 2020 daemon.warn odhcpd[1566]: DHCPV6 SOLICIT IA_NA from 000300012017429d4863 on br-lan: ok fdfd:bcc6:7d3c:10::3/128
Mon Mar 30 18:51:28 2020 daemon.notice netifd: WOWFIMarcissima (9975): udhcpc: sending renew to 100.92.0.1
Mon Mar 30 18:51:28 2020 daemon.notice netifd: WOWFIMarcia2 (9976): udhcpc: sending renew to 100.92.0.1
Mon Mar 30 18:51:28 2020 daemon.notice netifd: WOWFIMarcia2 (9976): udhcpc: lease of 100.93.42.218 obtained, lease time 900
Mon Mar 30 18:53:33 2020 daemon.warn odhcpd[1566]: DHCPV6 SOLICIT IA_NA from 000300012017429d4863 on br-lan: ok fdfd:bcc6:7d3c:10::3/128
Mon Mar 30 18:55:13 2020 daemon.notice netifd: WOWFIMarcissima (9975): udhcpc: sending renew to 100.92.0.1
Mon Mar 30 18:55:13 2020 daemon.notice netifd: WOWFIMarcissima (9975): udhcpc: lease of 100.93.42.218 obtained, lease time 900
Mon Mar 30 18:55:22 2020 daemon.warn odhcpd[1566]: DHCPV6 SOLICIT IA_NA from 000300012017429d4863 on br-lan: ok fdfd:bcc6:7d3c:10::3/128
Mon Mar 30 18:57:14 2020 daemon.warn odhcpd[1566]: DHCPV6 SOLICIT IA_NA from 000300012017429d4863 on br-lan: ok fdfd:bcc6:7d3c:10::3/128
Mon Mar 30 18:58:44 2020 daemon.info hostapd: wlan0: STA c4:9d:ed:18:bd:8d IEEE 802.11: authenticated
Mon Mar 30 18:58:44 2020 daemon.info hostapd: wlan0: STA c4:9d:ed:18:bd:8d IEEE 802.11: associated (aid 1)
Mon Mar 30 18:58:44 2020 daemon.notice hostapd: wlan0: AP-STA-CONNECTED c4:9d:ed:18:bd:8d
Mon Mar 30 18:58:44 2020 daemon.info hostapd: wlan0: STA c4:9d:ed:18:bd:8d RADIUS: starting accounting session EF2359849FB35710
Mon Mar 30 18:58:44 2020 daemon.info hostapd: wlan0: STA c4:9d:ed:18:bd:8d WPA: pairwise key handshake completed (RSN)
Mon Mar 30 18:58:45 2020 daemon.info dnsmasq-dhcp[2206]: DHCPREQUEST(br-lan) 192.168.8.7 c4:9d:ed:18:bd:8d
Mon Mar 30 18:58:45 2020 daemon.info dnsmasq-dhcp[2206]: DHCPNAK(br-lan) 192.168.8.7 c4:9d:ed:18:bd:8d address not available
Mon Mar 30 18:58:46 2020 daemon.warn odhcpd[1566]: DHCPV6 SOLICIT IA_NA from 0001000124894db4c49dede9079a on br-lan: ok fdfd:bcc6:7d3c:10::b2c/128
Mon Mar 30 18:58:46 2020 daemon.warn odhcpd[1566]: DHCPV6 REQUEST IA_NA from 0001000124894db4c49dede9079a on br-lan: ok fdfd:bcc6:7d3c:10::b2c/128
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq-dhcp[2206]: DHCPDISCOVER(br-lan) c4:9d:ed:18:bd:8d
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq-dhcp[2206]: DHCPOFFER(br-lan) 192.168.8.138 c4:9d:ed:18:bd:8d
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq[2206]: read /etc/hosts - 4 addresses
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq[2206]: read /tmp/hosts/odhcpd - 1 addresses
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq[2206]: read /tmp/hosts/dhcp.cfg01411c - 3 addresses
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq-dhcp[2206]: read /etc/ethers - 0 addresses
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq[2206]: read /etc/hosts - 4 addresses
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq[2206]: read /tmp/hosts/odhcpd - 1 addresses
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq[2206]: read /tmp/hosts/dhcp.cfg01411c - 3 addresses
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq-dhcp[2206]: read /etc/ethers - 0 addresses
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq-dhcp[2206]: DHCPREQUEST(br-lan) 192.168.8.138 c4:9d:ed:18:bd:8d
Mon Mar 30 18:58:49 2020 daemon.warn dnsmasq-dhcp[2206]: Ignoring domain sede.corp.sanpaoloimi.com for DHCP host name TP00671632
Mon Mar 30 18:58:49 2020 daemon.info dnsmasq-dhcp[2206]: DHCPACK(br-lan) 192.168.8.138 c4:9d:ed:18:bd:8d TP00671632
Mon Mar 30 18:58:58 2020 daemon.notice netifd: WOWFIMarcia2 (9976): udhcpc: sending renew to 100.92.0.1
Mon Mar 30 18:58:58 2020 daemon.notice netifd: WOWFIMarcia2 (9976): udhcpc: lease of 100.93.42.218 obtained, lease time 900