Sybase IQ 16 :Connection was terminated

Hi experts , we have some load process to sybase iq 16(using SAP Data Services) , but sometimes , not always, some process show the message:

SQL submitted to database <RDE> resulted in error <[Sybase][ODBC Driver][Sybase IQ]Connection was terminated>. The SQL

  submitted is <our sql statement>.

Is there any way to audit connection problems? i searched the iqmsg file but it shows nothing about this error, are there any parameters that i have to set in order to be able to have multiple connections running for a long time?

Thank you so much!