Operation is not valid due to the current state of the object|Power Query|Excel Forum|My Online Training Hub

My Power Query project processes 6 xml files and works fine since several months. Today the refresh command fails with error:

Operation is not valid due to the current state of the object

and other 165 lines of trace.

The error appears on the first line of the code:

let
    Source = Xml.Tables(File.Contents(" G:\Testdata\Xml\Import_To_PQ_Fails.xml"), null, 1250)
in 
    Source

The result is the same when I try to open this file from the UI Data - Get Data - From file - Xml. 

Using Win 10 + Excel 365 latest update. 

When I reduce the size of the xml file from 4,5 MB to 2,5 MB it is imported with no errors.

Tested on another computer, got the same error. What went worng?

You can download xml files here:

https://www.dropbox.com/sh/duq.....Ij9Oa?dl=0