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Reported on forum here and I experienced as well (most noticable when I did /etc/init.d/dnsmasq restart):

Sep 15 18:28:20 turris dnsmasq: DNS rebinding protection is active, will discard upstream RFC1918 responses!
Sep 15 18:28:20 turris dnsmasq: Allowing 127.0.0.0/8 responses
Sep 15 20:28:23 turris dnsmasq[3776]: started, version 2.80 DNS disabled
Sep 15 20:28:23 turris dnsmasq[3776]: compile time options: IPv6 GNU-getopt no-DBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth DNSSEC no-ID loop-detect inotify dumpfile
Sep 15 20:28:23 turris dnsmasq-dhcp[3776]: DHCP, IP range 192.168.1.100 -- 192.168.1.249, lease time 12h
Sep 15 20:28:23 turris dnsmasq-dhcp[3776]: read /etc/ethers - 0 addresses
Sep 15 18:28:23 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 15 18:28:23 turris /dhcp_host_domain_ng.py: DHCP update hostname [zařízení a ip adresa]
Sep 15 18:28:24 turris /dhcp_host_domain_ng.py: Refresh unbound leases
Sep 15 18:28:25 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 15 18:28:25 turris /dhcp_host_domain_ng.py: DHCP update hostname [zařízení a ip adresa]
Sep 15 18:28:26 turris /dhcp_host_domain_ng.py: Refresh unbound leases
Sep 15 18:28:26 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 15 18:28:26 turris /dhcp_host_domain_ng.py: DHCP update hostname [[zařízení a ip adresa]
Sep 15 18:28:27 turris /dhcp_host_domain_ng.py: Refresh unbound leases
Sep 15 18:28:28 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 15 18:28:28 turris /dhcp_host_domain_ng.py: DHCP update hostname [zařízení a ip adresa]
Sep 15 18:28:29 turris /dhcp_host_domain_ng.py: Refresh unbound leases
Sep 15 18:28:29 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 15 18:28:29 turris /dhcp_host_domain_ng.py: DHCP update hostname [zařízení a ip adresa]
Sep 15 18:28:31 turris /dhcp_host_domain_ng.py: Refresh unbound leases
Sep 15 18:28:31 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 15 18:28:32 turris /dhcp_host_domain_ng.py: Refresh unbound leases
Sep 15 18:28:33 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 15 18:28:33 turris /dhcp_host_domain_ng.py: DHCP update hostname [zařízení a ip adresa]
Sep 15 18:28:34 turris /dhcp_host_domain_ng.py: Refresh unbound leases
Sep 15 18:28:34 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 15 18:28:34 turris /dhcp_host_domain_ng.py: DHCP update hostname [zařízení a ip adresa]
Sep 15 18:28:35 turris /dhcp_host_domain_ng.py: Refresh unbound leases
Sep 15 18:28:36 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 15 18:28:36 turris /dhcp_host_domain_ng.py: DHCP update hostname [zařízení a ip adresa]
Sep 15 18:28:37 turris /dhcp_host_domain_ng.py: Refresh unbound leases
Sep 15 18:28:37 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 15 18:28:37 turris /dhcp_host_domain_ng.py: DHCP update hostname [zařízení a ip adresa]
Sep 15 18:28:39 turris /dhcp_host_domain_ng.py: Refresh unbound leases
Sep 15 18:28:39 turris /dhcp_host_domain_ng.py: Add_lease, hostname check failed
Sep 15 18:28:39 turris /dhcp_host_domain_ng.py: DHCP update hostname [zařízení a ip adresa]
Sep 15 18:28:40 turris /dhcp_host_domain_ng.py: Refresh unbound leases

What's going on and how to fix that?