Imported data in Power BI Desktop, serving as model for roughly 15 reports. Issue seems to happen right before a scheduled data refresh. The user(s) will navigate to a report which they have viewed before, even earlier that day, and the report comes back blank. Visuals are there, but no data. It eventually comes back but there are times when users are in meeting and they spend 10-15 minutes refreshing the report before the results come back. Causes confusion and doesn't do so well, and this is right after I sold them on Power BI. I'm running live and working for a massive global company so this is a big, big problem. This wasn't an issue during development. When working properly, the solution provides reports, with data, in < 10 seconds from the Power BI service.