Wifi clients disconnect after update to 3.11.1

It happened again. I can see new message in /var/log/messages:

2019-01-11 15:43:51 warning ddns-scripts[18017]: myddns_ipv4: Get registered/public IP for mydomain.cz failed - retry 145/0 in 60 seconds

I’m using myddns for change A record for my domain.

and I can have full log of this message:

2019-01-11 15:51:28 warning dnsmasq-dhcp[3727]: DHCP packet received on vethMJYJ00 which has no address
2019-01-11 15:51:45 warning dnsmasq-dhcp[3727]: DHCP packet received on vethMJYJ00 which has no address

One note: I’m also using squid for some PC’s. And all PC’s which use squid as proxy work! Currently I’m not in the place of the Omnia.