Write errors after updating to 1.8.4 alpine

We updated recently our influxdb installation (Docker) from 1.8.2 alpine to 1.8.4 alpine and suddenly the shard write errors (writeError from the _internal db) went from zero to 4-10. If I roll back to 1.8.2_alpine then the errors go back to zero.
I use following Monitoring dashboard: Set up monitoring dashboards | InfluxData Platform Documentation
Is it something, what should concern us?