NTBACKUP NOT RESPONDING UNTIL REBOOT

Hello
I am an IT professional with many clients using Sony AIT tape drive solutions in their Windows 2003 server systems.  The backups run from a scheduled task which works fine.  We first stop and restart the removable storage service in a batch file before commencing backup just to be sure there are no service issues from the previous nights backup.  All this works exceptionally well for us except for a couple of our customers where after an indeterminate period of time the backup system will no longer work.  It will detect the media when you run a manual backup and prompt to be overwritten, only to be followed up with "device is not responding, please check cables" blah blah blah.  The drive that is giving me the most grief at present is a SCSI unit however I have an identical setup, same hardware etc elsewhere and it works fine.
If I reboot the server everything returns to normal and I'm off again for another few days/weeks before it happens again.  I downloaded the Sony tape tools diagnostic software, upgraded firmware, changed tapes, cleaned the drive, upgraded tape driver in Windows and even run a read/write test using the Sony software.  All this works perfectly.  NTBackup still persists with the fault though.
I've even written a batch file to reboot the server every night before backup commences but this is not really a solution, only a crummy workaround.
Any ideas (aside from spending thousands on Veritas or BackupExec etc?)  This is doing my head in!!!

Regards,

Brendon
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Sai Prasad KinneraConnect With a Mentor Support Delivery ManagerCommented:
these are the things which you can certainly try

1) start rsm service with local administrator account
2) check if terminator attached to the tape drive is terminating properly or not( sony tape tools will not help in this)
3) check if there are any errors in event log for SCSI adapter
4) this can be an issue with the BUS on which the adapter is fixed but can be confirmed only after few tests
5) Do not go with sony tape tools, i have worked with hundred odd issues with sony tape drive and they have never shown a failed result and at the end of the issue tape drive was replaced
6) if reboot is fixing this problem it means scsi connection is getting flushed, which bascially means my point 2
7) update drivers and firmware if possible

last but not the least i would certainly suspect the cables along with the termination of scsi commands on the backup server
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