Loading data into CDS using On-Premise Gateway

Hi All,

I have a weird issue. Last week I setup on-premise gateway and was able to fetch data into CDS from SQL. Entity and related data was getting created but this week when I try the same process for different tables only the entity is getting created but related data is not getting loaded into CDS. When I check the dataflow history it has issues like - Resource not found for the segment, Lookup query execution failed. I m failing to understand why something that worked for some tables is failing for other tables this week. What am I missing here ? Hope someone can guide me through this, since I m fairly new to PowerApps and have been searching all documents and portals but in vain. Thanks in advance.