Scheduled Refresh does not work, Manual Refresh does

Hi,

I have a dataset scheduled to refresh every morning at 8:30 AM. This morning, I got an email that the scheduled refresh failed. Luckily I had Power BI open, so I clicked over and hit the 'Refresh now' option for the dataset without changing anything to see if it would work, and it did. As you can see in the below screenshot, these refreshes were within 60 seconds of each other -- with (as I said) no changes made from me in the interim. Any explanation for why this is the case? Should I try canceling and rescheduling the scheduled refresh?