Traefik stops seeing updates from Docker Enterprise

We use Traefik with Docker Enterprise. The endpoint it connects to is a load balancer for Docker UCP. This allows us to avoid running Traefik on the manager servers.

The issue we see is that, occasionally, Traefik will not notice changes and will require a restart. For example, new deployments do not get picked up. We have seen this with various versions of Traefik. Wondering if others with a similar configuration have the same problem?