Hi! I had the same issue but with dataflows. They stop refreshing on their own, but show as still having a refresh time, but it is in the future. Almost as thought the dataflow itself has stopped in time?
This is a screenshot of now / 31st Jan 13:45. We do not have premium capacity, this is one one workspace that has multiple other dataflows set up in it. From here we refresh the data and build reports from this dataflow. Manually refreshing in the service does not solve it. Going into the dataflow and making an edit, closing it and saying yes to "refresh now" does not refresh it.
As this is the second time to happen in a week, it concerns me, as there is no alert either to inform that something is amiss. Both times I have been informed by the business that it is not working, even though we carry out monitoring.
Scheduled refresh ran normally and recorded the refresh time , but the data haven't updated . When you refreshed manually , is there any errors ? If no error message , I suggest you to open a Support Ticket for free and a dedicated Microsoft engineer will come to solve the problem for you.