Backup to tape library fails with a 'POWER ON, RESET, OR BUS DEVICE RESET OCCURRED' error. (4038224)

Backup to tape library fails with a 'POWER ON, RESET, OR BUS DEVICE RESET OCCURRED' error.

Backups fail due to the tape library going offline.

NetVault Backup Environment Details...
NetVault Server: 8.5.3 Windows 2003.
Backup Device: Overland NEO 2000 tape library attached via FC to a NetApp Filer (OnTap 8.1.2P3 7-Mode).
Plugin: installed the NDMP 7.6.11 with the NDMP 5.7.5 Consolidation Patch to support the OnTap 8.x Filer Operating System.

Please Note: That NetVault Backup 8.5.x and 8.6.x are no longer supported after end of January 2015. Further details can be found on the following link under the Support Policies & PLC sub tab:

https://support.quest.com/netvault-backup/9.2

The following errors were within the NetVault logs:

1] Information   2014/02/24 06:59:34   189   Data Plugin   WTH-BCK2   NDMP: NORMAL 190: DUMP: Tape write failed.
2] Information   2014/02/24 06:59:34   189   Data Plugin   WTH-BCK2   NDMP: NORMAL 191: DUMP: DUMP IS ABORTED
3] Error   2014/02/24 06:59:34   189   Data Plugin   WTH-BCK2   NDMP: ERROR 192: DATA: Backup terminated: EVENT: I/O ERROR (for /vol/vol_data/.snapshot/nightly.0)
4] Error   2014/02/24 06:59:34   189   Data Plugin   WTH-BCK2   Data operation halted due to unrecoverable internal NDMP server error
5] Error   2014/02/24 06:59:35   189   Media   WTH-BCK2   WTH-BCK2 Tape wth-fas2240:nrst0a (IBM ULTRIUM-TD6): had transfer aborted

With sub text:
SCSI    :07496   16       0  65934 CMD STATUS 'CHECK CONDITION' [2]
SCSI    :07496   17       0  65934 CMD SENSE KEY 'UNIT ATTENTION   ' [6] - ASC 29 ASCQ 00
SCSI    :07496   18       0  65934 CMD SENSE INFO 'POWER ON, RESET, OR BUS DEVICE RESET OCCURRED'
SCSI    :07496   20       0  65934 CMD RETURN VALUE 2
SCSI    :07496   14       0  65934 CMD TEST UNIT READY [ 00 00 00 00 00 00  ]
CAMNDMP :07496  157       0  65934 CMD 00 00 00 00 00 00

6] Error   2014/02/24 06:59:35   189   Jobs   WTH-BCK2   Job Status: Backup Failed