Backup Exec job rate suddenly slow

Hi all, yesterday I updated the veritas tape drivers to try and correct an issue where the server would occasionly loose contact with the robotic library. but now the job rate has been cut in half. i am trying to determine if this is just a fluke or if the driver update caused it. i have seen in the past the occasionally the job rates will fluctuate. so this is either just a coincidence or the driver update did something. any helpful hints or suggestions would be greatly appreciated.