Czym może być spowodowane "flapowanie" portu lan eth0 ?

W logach mam wpisy

Aug  4 08:11:00 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: group key handshake completed (RSN)
Aug  4 08:21:00 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: group key handshake completed (RSN)
Aug  4 08:25:26 router kern.info kernel: [177341.000000] eth0: link down
Aug  4 08:25:26 router kern.info kernel: [177341.000000] br-lan: port 1(eth0) entered disabled state
Aug  4 08:31:00 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: group key handshake completed (RSN)
Aug  4 08:41:00 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: group key handshake completed (RSN)
Aug  4 08:42:44 router daemon.info hostapd: wlan0: STA 10:08:c1:32:49:37 IEEE 802.11: authenticated
Aug  4 08:42:44 router daemon.info hostapd: wlan0: STA 10:08:c1:32:49:37 IEEE 802.11: associated (aid 1)
Aug  4 08:42:44 router daemon.info hostapd: wlan0: STA 10:08:c1:32:49:37 WPA: pairwise key handshake completed (RSN)
Aug  4 08:42:49 router daemon.info dnsmasq-dhcp[1535]: DHCPDISCOVER(br-lan) 10:08:c1:32:49:37
Aug  4 08:42:49 router daemon.info dnsmasq-dhcp[1535]: DHCPOFFER(br-lan) 192.168.1.193 10:08:c1:32:49:37
Aug  4 08:42:49 router daemon.info dnsmasq-dhcp[1535]: DHCPREQUEST(br-lan) 192.168.1.193 10:08:c1:32:49:37
Aug  4 08:42:49 router daemon.info dnsmasq-dhcp[1535]: DHCPACK(br-lan) 192.168.1.193 10:08:c1:32:49:37
Aug  4 08:51:00 router daemon.info hostapd: wlan0: STA 10:08:c1:32:49:37 WPA: group key handshake completed (RSN)
Aug  4 08:51:00 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: group key handshake completed (RSN)
Aug  4 09:01:00 router daemon.info hostapd: wlan0: STA 10:08:c1:32:49:37 WPA: group key handshake completed (RSN)
Aug  4 09:01:00 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: group key handshake completed (RSN)
Aug  4 09:09:32 router kern.info kernel: [179986.500000] eth0: link up (1000Mbps/Full duplex)
Aug  4 09:09:32 router kern.info kernel: [179986.500000] br-lan: port 1(eth0) entered forwarding state
Aug  4 09:09:32 router kern.info kernel: [179986.510000] br-lan: port 1(eth0) entered forwarding state
Aug  4 09:09:34 router kern.info kernel: [179988.510000] br-lan: port 1(eth0) entered forwarding state
Aug  4 09:09:38 router daemon.info dnsmasq-dhcp[1535]: DHCPDISCOVER(br-lan) 192.168.1.137 0c:fe:45:a6:d4:e1
Aug  4 09:09:38 router daemon.info dnsmasq-dhcp[1535]: DHCPOFFER(br-lan) 192.168.1.137 0c:fe:45:a6:d4:e1
Aug  4 09:09:38 router daemon.info dnsmasq-dhcp[1535]: DHCPREQUEST(br-lan) 192.168.1.137 0c:fe:45:a6:d4:e1
Aug  4 09:09:38 router daemon.info dnsmasq-dhcp[1535]: DHCPACK(br-lan) 192.168.1.137 0c:fe:45:a6:d4:e1
Aug  4 09:11:00 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: group key handshake completed (RSN)
Aug  4 09:11:08 router daemon.info hostapd: wlan0: STA 10:08:c1:32:49:37 IEEE 802.11: deauthenticated due to local deauth request
Aug  4 09:21:00 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: group key handshake completed (RSN)
Aug  4 09:31:00 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: group key handshake completed (RSN)
Aug  4 09:41:00 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: group key handshake completed (RSN)
Aug  4 09:51:00 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: group key handshake completed (RSN)
Aug  4 10:00:07 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d IEEE 802.11: disassociated due to inactivity
Aug  4 10:00:08 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d IEEE 802.11: deauthenticated due to inactivity (timer DEAUTH/REMOVE)
Aug  4 10:01:07 router kern.info kernel: [183082.000000] eth0: link down
Aug  4 10:01:07 router kern.info kernel: [183082.000000] br-lan: port 1(eth0) entered disabled state
Aug  4 11:04:18 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d IEEE 802.11: authenticated
Aug  4 11:04:18 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d IEEE 802.11: associated (aid 1)
Aug  4 11:04:18 router daemon.info hostapd: wlan0: STA 90:c1:15:50:58:3d WPA: pairwise key handshake completed (RSN)
Aug  4 11:04:18 router daemon.info dnsmasq-dhcp[1535]: DHCPDISCOVER(br-lan) 90:c1:15:50:58:3d
Aug  4 11:04:18 router daemon.info dnsmasq-dhcp[1535]: DHCPOFFER(br-lan) 192.168.1.187 90:c1:15:50:58:3d
Aug  4 11:04:18 router daemon.info dnsmasq-dhcp[1535]: DHCPREQUEST(br-lan) 192.168.1.187 90:c1:15:50:58:3d
Aug  4 11:04:18 router daemon.info dnsmasq-dhcp[1535]: DHCPACK(br-lan) 192.168.1.187 90:c1:15:50:58:3d android_93bc9228e946457b
Aug  4 11:09:04 router kern.info kernel: [187159.000000] eth0: link up (1000Mbps/Full duplex)
Aug  4 11:09:04 router kern.info kernel: [187159.000000] br-lan: port 1(eth0) entered forwarding state
Aug  4 11:09:04 router kern.info kernel: [187159.010000] br-lan: port 1(eth0) entered forwarding state
Aug  4 11:09:06 router kern.info kernel: [187161.010000] br-lan: port 1(eth0) entered forwarding state

Statystyki pokazują niestabilny poziom sygnału wifi dla podłaczonego telefonu z androidem.
Czy wadliwie działające radio może "kłaść" interfejs lan eth0 w wyniku czego nie działają również urządzenia na kablu ?