The credentials provided for the OData source are invalid

Hi, 

I have a report published on powerBI service which is using an Odata connector.  Sometimes the scheduled refresh fails and the reason is "invalid credentials" even though they are correct. 

the following settings are used:

Type of source:  OData

URL: https://odata.ppmpro.com/InnotasOdataService/Entities('XXXXX@YYYYY')

Authentication method: Basic

Privacy-settings: None

the refresh history of my dataset is the following:

It keeps failing every now and then.

Help is much appreciated, thanks!