OneNote download timeout exceeded

[tm67]

Hi
Support Case #07786158
Since a few weeks, we are seeing a lot of warnings "Download timeout exceeded". Mostly OneNote files but also a pdf document.
Currently seen on at least 9 different tenants and seen on 2 completly different vb365 installations both on latest patch.

We do not want to surpress OneNote warnings as described in https://www.veeam.com/kb4529

Support tells us to create a Microsoft support case - we have not done this yet for those warnings. Does anyone has expirience with it, what will/can Microsoft do in such a case?
Or is this with the OneNotes a current known issue on Microsoft side? Or on the latest vb365 patch?
Thanks for any comment
Timo