Error connecting to data files in SharePoint Online

Yes, getting exact same error from 2/13 6am but it's intermittent on PBI Service. Tried downgrading API version to 14 and it seems stable from desktop as well as datasets on PBI Service aren't failing to refresh.

Not sure if this is related to below

https://techcommunity.microsoft.com/t5/sharepoint/disable-comments-in-lists/m-p/1980665

but this old one seems to work by downgrading to version 14

https://community.powerbi.com/t5/Power-Query/Connecting-to-a-SharePoint-List-Office-365-error/m-p/8893

https://docs.microsoft.com/en-us/powerquery-m/sharepoint-contents

Even using "Auto" for version seems to be working, but it fails sometimes (but not as often as version 15).

let
Source = SharePoint.Files("https://your_sharepoint_address", [ApiVersion = 14])
...
...

But the question remains - why the working API version 15 (from several months) is breaking suddenly.

-Niteen