datastage作业hang住

最近生产上经常有ds作业hang住，杀掉进程重做后偶尔成功，偶尔不成功，报错信息如下

main_program: (aptoci.C:500). Message: ORA-12152: TNS:unable to send break message
      (aptoci.C:637). Message: ORA-03114: not connected to ORACLE
      (aptoci.C:549). Message: ORA-03114: not connected to ORACLE
      (aptoci.C:606). Message: ORA-24338: statement handle not executed
      (aptoci.C:493). Message: ORA-03114: not connected to ORACLE
      (aptoci.C:637). Message: OCI_INVALID_HANDLE 
      (aptoci.C:545). Message: OCI_INVALID_HANDLE 
      (aptoci.C:606). Message: OCI_INVALID_HANDLE 
      (aptoci.C:493). Message: ORA-03114: not connected to ORACLE