DM_GWPipeline_Gateway_InvalidConnectionCredentials - Sharepoint

Hi,

I am using Sharepoint files as data source for multiple reports on Power BI Service, refresh is scheduled automatically and it works. These files are marged with other data from SAP, Azure SQL Database and we use gateway for on premise data.
But refresh fails for 1 big dataset (1 gb) and the issue is that there is no rule when it fails.
Example: it is refreshed successfully several days and then one day it fails.
Notes:
1) we are using power bi premium

2) sharepoint credentials are entered, saved and are not changed

3) all other datasets that use these same Sharepoint files and credentials never failed refreshed

 

Here is the error:

{"error":
{"code":"DM_GWPipeline_Gateway_InvalidConnectionCredentials"
,"pbi.error":
{"code":"DM_GWPipeline_Gateway_InvalidConnectionCredentials"
,"parameters":{}
,"details":
[
{"code":"DM_ErrorDetailNameCode_UnderlyingErrorCode"
,"detail":{"type":1,"value":"-2147467259"}
}
,{"code":"DM_ErrorDetailNameCode_UnderlyingErrorMessage"
,"detail":{"type":1,"value":"The credentials provided for the SharePoint source are invalid. (Source at https://..."}
}
,{"code":"DM_ErrorDetailNameCode_UnderlyingHResult"
,"detail":{"type":1,"value":"-2147467259"}
}
,{"code":"Microsoft.Data.Mashup.CredentialError.DataSourceKind"
,"detail":{"type":1,"value":"SharePoint"}
}
,{"code":"Microsoft.Data.Mashup.CredentialError.DataSourceOriginKind"
,"detail":{"type":1,"value":"SharePoint"}
}
,{"code":"Microsoft.Data.Mashup.CredentialError.DataSourceOriginPath"
,"detail":{"type":1,"value":"https://..."}
}
,{"code":"Microsoft.Data.Mashup.CredentialError.DataSourcePath"
,"detail":{"type":1,"value":"https://..."}
},
{"code":"Microsoft.Data.Mashup.CredentialError.Reason"
,"detail":{"type":1,"value":"AccessUnauthorized"}
}
,{"code":"Microsoft.Data.Mashup.MashupSecurityException.DataSources"
,"detail":{"type":1,"value":"[{\"kind\":\"SharePoint\",\"path\":\"https://..."}
]"}
}
,{"code":"Microsoft.Data.Mashup.MashupSecurityException.Reason"
,"detail":{"type":1,"value":"AccessUnauthorized"}}
]
,"exceptionCulprit":1
}
}
}

Thanks in advance,
Nemanja Andic