Require a solution as per tape hardware LTO2 & Backup Exec version

Hi All ,

First of all i would like to tell you the backup exec version & Tape library H/w details

Backup Exec version : 12.5

Tape Library Hardware Details :IBM Product ID :ULT380-TD2  , LTO2 Tape drive

When ever onsite person changes backup tape the tape library is showing offline from backup exec & some times it sowing the library door was not closed properly

To fix the isue currently im a following a sequntial reboot of server + tape library

Need a solution to fix the issue ,

Regards

Vaka