traefik switching between services

In our Kubernetes environment, we use traefik to expose some services. We had some incidents recently and I noticed that during the period of these incidents, traefik suddenly started using another "service" and some time later, without any intervention, it returns to the correct "service". Attached is the image that exemplifies this situation.
I would like to know if anyone here has experienced this, and what would be the cause of this sudden change.