Hard disk randomly unmount itself

  • I'm trying to understand why a single data disk formatted in ext4 is randomly unmounting itself. When this happens I get the following email:

    after this if I run manually a

    mount /srv/dev-disk-by-label-5TB

    it works again.
    NOTE: this happens on both primary and backup NAS with the same type of disk: Seagate st5000dm000

    I did try already to remove all the NFS/SMB references to it, delete the shared folders running on the disk and have a sort of fresh start but this still happens.The other disks create no issues.Any inputs please?

    Thanks :-)

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