Loosing IPv4 and DHCP constantly asking for IP

Using Ubuntu 16.04, almost every day I'm loosing IPv4 address, being dropped by Avahi Daemon. Also, I see the DHCP is not "waiting" for leasing time to finish to request an address again, it does it every some minutes, but I cannot see a pattern. Then, suddenly and without any previous error, Avahi Daemon withdraws the IP from interface eth0: Aug 11 11:55:14 jorgee avahi-daemon: Withdrawing address record for 192.168.2.94 on eth0. This is the last part of the syslog. Aug 11 11:43:11 jorgee systemd: Started Automatically refresh installed snaps. Aug 11 11:43:11 jorgee systemd: snapd.refresh.timer: Adding 4h 33min 5.892892s random time. Aug 11 11:43:11 jorgee systemd: snapd.refresh.timer: Adding 48min 39.947211s random time. Aug 11 11:43:13 jorgee dbus: [system] Reloaded configuration Aug 11 11:44:04 jorgee dhclient: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x188018e6) Aug 11 11:44:04 jorgee dhclient: DHCPACK of 192.168.2.94 from 192.168.2.254 Aug 11 11:44:04 jorgee root: /etc/dhcp/dhclient-enter-hooks.d/avahi-autoipd returned non-zero exit status 1 Aug 11 11:44:05 jorgee dhclient: bound to 192.168.2.94 -- renewal in 800 seconds. Aug 11 11:46:15 jorgee dhclient: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x51cc22fc) Aug 11 11:46:15 jorgee dhclient: DHCPACK of 192.168.2.94 from 192.168.2.254 Aug 11 11:46:15 jorgee root: /etc/dhcp/dhclient-enter-hooks.d/avahi-autoipd returned non-zero exit status 1 Aug 11 11:46:15 jorgee dhclient: bound to 192.168.2.94 -- renewal in 758 seconds. Aug 11 11:47:33 jorgee dhclient: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x6788bfce) Aug 11 11:47:33 jorgee dhclient: DHCPACK of 192.168.2.94 from 192.168.2.254 Aug 11 11:47:33 jorgee root: /etc/dhcp/dhclient-enter-hooks.d/avahi-autoipd returned non-zero exit status 1 Aug 11 11:47:33 jorgee dhclient: bound to 192.168.2.94 -- renewal in 746 seconds. Aug 11 11:49:08 jorgee systemd-timesyncd: Timed out waiting for reply from 192.168.2.254:123 (192.168.2.254). Aug 11 11:52:42 jorgee dhclient: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x41dfce98) Aug 11 11:52:42 jorgee dhclient: DHCPACK of 192.168.2.94 from 192.168.2.254 Aug 11 11:52:42 jorgee dhclient: bound to 192.168.2.94 -- renewal in 703 seconds. Aug 11 11:54:16 jorgee dhclient: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x7456460e) Aug 11 11:54:16 jorgee dhclient: DHCPACK of 192.168.2.94 from 192.168.2.254 Aug 11 11:54:16 jorgee root: /etc/dhcp/dhclient-enter-hooks.d/avahi-autoipd returned non-zero exit status 1 Aug 11 11:54:17 jorgee dhclient: bound to 192.168.2.94 -- renewal in 770 seconds. Aug 11 11:55:14 jorgee avahi-daemon: Withdrawing address record for 192.168.2.94 on eth0. Aug 11 11:55:14 jorgee avahi-daemon: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.2.94. Aug 11 11:55:14 jorgee avahi-daemon: Interface eth0.IPv4 no longer relevant for mDNS. Aug 11 11:55:16 jorgee whoopsie: [11:55:16] Cannot reach: https://daisy.ubuntu.com Aug 11 11:55:16 jorgee whoopsie: [11:55:16] offline Aug 11 11:56:14 jorgee sudo: pam_ecryptfs: pam_sm_authenticate: /home/jorgee is already mounted Aug 11 11:56:34 jorgee dhclient: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x2894ec32) Aug 11 11:56:34 jorgee dhclient: send_packet: Network is unreachable Aug 11 11:56:34 jorgee dhclient: send_packet: please consult README file regarding broadcast address. Aug 11 11:56:34 jorgee dhclient: dhclient.c:2386: Failed to send 300 byte long packet over fallback interface. Aug 11 11:56:37 jorgee dhclient: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x2894ec32) Aug 11 11:56:37 jorgee dhclient: send_packet: Network is unreachable Aug 11 11:56:37 jorgee dhclient: send_packet: please consult README file regarding broadcast address. Aug 11 11:56:37 jorgee dhclient: dhclient.c:2386: Failed to send 300 byte long packet over fallback interface. Aug 11 11:56:42 jorgee dhclient: DHCPREQUEST of 192.168.2.94 on eth0 to 192.168.2.254 port 67 (xid=0x2894ec32) Aug 11 11:56:42 jorgee dhclient: send_packet: Network is unreachable Aug 11 11:56:42 jorgee dhclient: send_packet: please consult README file regarding broadcast address. Aug 11 11:56:42 jorgee dhclient: dhclient.c:2386: Failed to send 300 byte long packet over fallback interface. Edit: Bind9 config: acl lan { 127.0.0.0/8; 192.168.0.0/16; }; view "lan-dmz" { match-clients { key lan-dmz; !key wan; lan; }; server 192.168.1.24 { keys lan-dmz; }; allow-recursion {lan; }; recursion yes; zone "aaaa.edu.ar" { type master; file "/var/cache/bind/aaaa.edu.ar.lan-dmz"; }; zone "aaaa.local" IN { type forward; forwarders { 192.168.1.123; 192.168.1.124;}; }; }; view "wan" { match-clients { key wan; !key lan-dmz; !lan; any; }; server 192.168.1.24 { keys wan; }; recursion no; zone "aaaa.edu.ar" { type master; allow-transfer { 192.168.1.24; 170.210.44.2; 170.210.44.3; }; allow-query { any; }; also-notify { 192.168.1.24; 170.210.44.2; 170.210.44.3; }; file "/var/cache/bind/aaaa.edu.ar.wan"; }; };