ML3 Tape drive calibration

I just setup a new ML3 tape library with three LTO9 FC HH drives. Everything seems to be OK except for one strange behavior. When I first setup the library in my backup app. it runs a validation where it mounts and unmounts a tape into each drive. When i did this the mount portion took 45 minutes for the first tape drive. During this time the status in the web gui for the tape  drive is 'Calib' indicating the drive is running a calibration. After this is done it unmounts the drive without issue. It does not give an error during this time. the other two drives mounted and unmounted tapes quickly. I thought it might be a one time thing but im now running a backup and its gone into calib mode again and appears to be  doing the same thing. is this drive broken? The firmware for the library and the drive is at the latest level.
Steve