Hi
I have seen that before copying the files it executes only 'net stop OracleServiceXXX on both the system and it does not do any shutdown on the database itself. If database shutdown was the real problem then it should seen in other copy also because in this process I am copying three databases to local and this problem is seen only for one database data file. Also this problem couldn't be reproduced in our test environment but seen on customer side.

Should I need to shutown the database also before this copy like
1. net stop OracleServiceXXX
2. sqlplus /nolog
set instance XXX
connect /as sysdba
shutown immediate

Any thoughts.....