I just had a refresh hang (unresponsive to cancellation) to the point that cancelling doesn't work and I needed to download and overwrite the report on the server. Report performance now that I've...
This is not an issue with the report or queries, it runs fine the vast majority of the time, it just failed to refresh and required manual intervention.
The degredation is Power BI service side, and was transient, but not noted in any service status dashboards.