Copy Files action sometimes results in corrupt file

[kinook]

The Copy Files action calls the CopyFileEx Windows API to copy a file.

The action will retry a failed copy if 'Retries on failure' on the Errors tab is non-zero and the error result is one of:

ERROR_PATH_NOT_FOUND
ERROR_NOT_READY
ERROR_CRC
ERROR_SHARING_VIOLATION
ERROR_LOCK_VIOLATION
ERROR_NETWORK_BUSY
ERROR_UNEXP_NET_ERR
ERROR_SHARING_PAUSED
ERROR_REQ_NOT_ACCEP
ERROR_REDIR_PAUSED
ERROR_NET_WRITE_FAULT
ERROR_DRIVE_LOCKED
ERROR_BROKEN_PIPE
ERROR_OPEN_FAILED
ERROR_PATH_BUSY
ERROR_BUSY

or if 'Wait for share names to be defined...' on the Errors tab is checked and it is one of these errors:

ERROR_REM_NOT_LIST
ERROR_BAD_NETPATH
ERROR_DEV_NOT_EXIST
ERROR_NETNAME_DELETED
ERROR_BAD_NET_NAME

If the action did not retry a failed copy, the CopyFileEx API must have returned another error code.

I don't know what could have caused that sort of problem.