Shadow copies issues with Windows Server 2012 R2, deduplication and defragmentation

Hello,
I have a virtual Windows Server 2012 R2 with a data volume with deduplication and shadow copies enabled.
During this weekend some Windows process deleted all the shadow copies and I don't know what process has caused this issue.
After taking a look at Internet forums it seems that could be related to defragmentation process and cluster size but if I review the logs it seems that shadow copies deletion is during some deduplication optimization process (Background Optimization, WeeklyGarbageCollection
and WeeklyScrubbing) and 1 hour after defragmentation.
The related events are a lot of volsnap 33 and finishing with volsnap 36.
Any help would be appreciated.
Thank you.

Hi Ricard,
Above all, here is a long discussion about a "losing all volume shadow copy" issue:
https://social.technet.microsoft.com/Forums/windowsserver/en-US/204e8cce-cd1f-4ca2-852e-a5f09a77c04c/volsnap-event-id-25-and-loss-of-previous-backups?forum=windowsbackup
As it mentioned, it could be caused by disk I/O. When you have high input/output traffic on the original volume, the shadow copy storage area cannot grow fast enough to hold all the copy-on-write changes. This causes deletion of all the shadow copies on the
original volume.
Deduplication will cause a high disk I/O for sure so it could be the cause of this issue.
Here are some suggestions for this issue:
a. Put the shadow copy storage on another volume, even if the volume is located on the same hard disk.
b. Make sure that the volume that causes the issue is not the same volume that contains the paging file. If it contains paging file, consider putting the paging file on another volume.
c. Make sure that the volume is not used as the shadow copy storage for any other volume.
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Shadow copies issues with Windows Server 2012 R2, deduplication and defragmentation

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