I been watching my logs file and as soon this appeared dnsmaq restarted?
"user.debug kernel: vlan2: del 33:33:ff:87:f1:ce mcast address from master interface"
"user.debug kernel: vlan2: add 33:33:ff:87:f1:ce mcast address to master interface"
"user.debug kernel: vlan2: del 33:33:ff:87:f1:ce mcast address from master interface"
"user.debug kernel: vlan2: add 33:33:ff:87:f1:ce mcast address to master interface"