Using Fast Load were it fails with with contention error:
PFL0075E - Tablespace/Indexspace failed STOP
How to avoid leaving the tablespace in Stopped status?
Release : 20.0
Component : CA Fast Load for DB2 for z/OS
Currently there isn't anything in Fast Load to avoid contention with the object.
The best answer is a procedure change, you may consider adding a START UP ACCESS FORCE step in the event you hit this contention problem again, that will insure the tablespace is not left in STOPPED status after Fast Load fails with PFL0075E.