Admin Weekend Scheduled Job Completing in Error

I have a weekend admin job (reclaiming space) that is not completing successfully at the end of its run. From the logs, I see errors: ANR1080W Space reclamation is ended for volume XXX. The reclamation of the media stops from the volume and fails for the rest. Volume varies each weekend job run, so I do not believe anything is wrong with the volumes. The job fails at nights, so I am thinking some process or other is conflicting and causing it to abend. No other scheduled jobs are causing it to abend, I don't think.

Any assistance will be greatly appreciated.
Has anyone experienced this before?