The XML for Analysis request timed out before it was completed.

I have the same issue as well; for a 650MB data model with Oracle. It says "The XML for Analysis request timed out before it was completed. Timeout value: 7200 sec." Then it specified my fact table. In my data model, the fact table is filtered, so that entire data model, with other lookup/dimensional tables, is less than 1GB (650MB to be exact). My fact table in the Oracle database is about 1.3 GB. I am using Power BI Pro. Could any of these be the reason why? Will going Premium solve this? 

I have tried various scenarios, including: refreshing the data model in Power BI Desktop and republishing (as a new renamed data model). My data model has a calculated table that uses SUMMARIZE from the fact table; can this be it?