Can't get data using implementation 2. HELP

I am trying to import a large list  (8K items and growing) from sharepoint and if I wuse implementation 2 I get the following error and am not able to get the data.

DataSource.Error: Web.Contents failed to get contents from 'https://xxxxxxx.sharepoint.com/sites/xxxxReporting/_api/Web/Lists(guid'2b455965-851b-401e-a7a1-ce0faca66aa5')/RenderListDataAsStream' (500): Internal Server Error
Details:
DataSourceKind=SharePoint
DataSourcePath=https://xxxxxxxxxx.sharepoint.com/sites/xxxxxReporting
Url=https://xxxxxxxxxx.sharepoint.com/sites/xxxxxxReporting/_api/Web/Lists(guid'2b455965-851b-401e-a7a1-ce0faca66aa5')/RenderListDataAsStream

If I use implementation 1 then it works 

Can anyone shed some light on this matter.

Does this have anything to do with the number of items in the list and if so is there any workaround .