Remove Tape (I/E port) fails

We have an IBM 3576 Tape Library with 2 LTO3 drives (using the ltstape.sys 
driver from Microsoft) and want to export tapes to the I/E ports of the Tape 
Library.

When I select the tapes to be removed from the library (ready for offsite 
tapes) the system reports 'Prepairing to remove tape from IBM TotalStorage 
3576 Modular Tape Library' for quite a long time and eventually the task 
failes with the following error:

Tape Library IBM TotalStorage 3576 Modular Tape Library could not be 
contacted. All jobs for Tape Library IBM TotalStorage 3576 Modular Tape 
Library will fail if the connection is not established. The attempted contact 
failed for the following reason:
(ID: 3301)


Strange error because all other operations such as adding tapes, backupping 
and restoring works just fine. We just can't get tapes out of the library 
because of this issue. Is there a solution/work around for this?

Thanks four your help,