NDMP backup failed

Hello,

I had NDMP backup failed for my Netapp appliance, it is failing for a specific volume not all the volumes. here is the errors i can see

nasdir:/vol/nas7 nsrndmp_2fh: interrupted, exiting the File History merging...

nasdir:/vol/nas7 nsrndmp_save: backup failed.

nasdir:/vol/nas7 nsrndmp_2fh: nsrndmp_2fh aborted.

nasdir:/vol/nas7 aborted due to inactivity

How can i troubleshoot that, and why it is failing for that specific volume ?

APpreciate your help.

Mourad