@PedroRV , it could be related, though we need to do some digging.

When you see an error, can you see if the chunk file in question is actually there or not?  

If not, then you’ll need to see why it was deleted.

If it is there, my initial suspicion would be that you have some Anti Virus program monitoring that folder and locking the files.

This exclusion list is worth a look:

https://documentation.commvault.com/11.25/expert/8665_recommended_antivirus_exclusions_for_windows.html

I note that the CV_MAGNETICS are on a route of a VM of Azure, when I present this path on the librari this appear that is online.

But after the sent the beging Data Verification or a Auxiliar Copy this apper who no accesible. 

@JMherrDaat , @PedroRV this definitely looks strange based on the behavior.

Can you open a support case for this issue and share the case number?

@JMherrDaat , @PedroRV were you able to get this resolved?

Based on what @JMherrDaat said, it drops connectivity once you initiate an aux Copy.  This leads me to believe there is an issue with the account that is trying to write to the drive.