Logical drives operation fails during "Verify Label in progress"

Hi

I'm having the following problem with some logical drives of a library: Any operation ends with error after a few minutes showing "verify label in progress" repeatedly. In some cases the drive identify the volume as NULL, in other cases, just ends with "verify label in progress".

I'm using Legato Networker 7.4 sp2, and the messages are as follows

cancellation: none;
             completion code: ;
               error message: verify label in progress on DRIVE05,
                              verify label in progress on DRIVE05,
                              Expected volume `D00182' in slot `54'. The actual volume is ` '.,
                              verify label in progress on DRIVE05;
                 last update: 1274716795;
                    messages: Unloading volume `-' from device `DRIVE05' to slot 54.;
                        name: SILOSTK;
          operation instance: 7675;
            operation source: GUI jb op;
                    progress: failed;
             prompt response: ;
                      prompt: ;
                  start time: 1274716657;
                      status: failed

------------>Other case<----------------

cancellation: none;
             completion code: ;
               error message: verify label in progress on DRIVE02,
                              verify label in progress on DRIVE02,
                              verify label in progress on DRIVE02;
                 last update: 1274719430;
                    messages: ;
                        name: SILOSTK;
          operation instance: 7694;
            operation source: GUI jb op;
                    progress: retryable;
             prompt response: ;
                      prompt: ;
                  start time: 1274719235;
                      status: retryable

Someone knows how can I solve this Issue?