The NAS backup is unable to find the Tape which is present in the Scratch pool and is not expired.

Sometimes, the JOb looks for 3 or 4 tapes and eventually mounts the tapes by just throwing up warning message.

However, sometimes it just wont mount any tapes and it fails the backup

This occours only wirh the NAS jobs however the other Jobs(Windows and Linux) are running fine.Any idea?