restore files failed on Backupexec 15

Hi,

 

When restoring files from my tape, the job failed and complains that it needs 1.5TB of staging. We had a hard time and provided 1.5TB worth of staging location. But the restoration failed as the destination server's remote agent stopped.

We restarted the backup job but it complains that the staging needs 3TB!?

How could this be? Is it a software bug?