What could be the causes for Local Client Copy (SCCL) cancelled suddenly SAP

1. Check for the System availability whether System is up and running or shutdown
2. It might cause if there are no sufficient work process resources or memory is consuming more. Check for ST06 and SM50
3. It can also be with User session connectivity. If there is any connection timeout error then client copy might affects. Check for the SM04.
4. Other thing is the program is cancelled by the user and terminated by himself. Check for SCC3 client logs