Docker container Embedded DNS server

Hi, I am seeing intermittent DNS resolution issue in the running container. Container is running on sles 12 sp3 and using latest docker version. Container is created with custom network and has entry in /etc/resolv.conf file. Embedded DNS server ( should forwards the query to the host. I can see host /etc/resov.conf has correct DNS entry. But its failing intermittently. Restating docker and container helps. But its not a acceptable solution for customers. Any sggestion.