Dashboard loading issue with SSAS Tabular Reports

We have created Power BI dashboard which contains reports pointing to different data sources. i.e SSAS Tabular instance and SQL Azure.

For first time, when i pinned my visualizations to a dashboard, the dashboard is loading perfectly fine. After few minutes, when i tried to view the dasboard the visualizations which are pinned from SSAS Tabular instance are not loading in dashboard ( I could see the visualizations clearly in report). Visualizations pinned from SQL Azure are visible in the dashboard.

We have seen this issue for two dashboards which we have deployed to Power BI Service.

We have given access to SSAS Tabular instance as well.

Appreciate if someone could help us here as some business users are currently viewing dashboard.

Thanks in advance!!