delphi - Unobserved TOmniTask... Task controller needs an owner?

Question

I have written a program in Delphi 2007 using the OmniThreadLibrary. I found that the program was growing bigger and bigger in memory as it ran using the following structure to launch tasks.

class procedure saveIniFile(const iniFile: TStringList);
    var
        task  : IOmniTaskControl;
     begin
        task := CreateTask(saveIniFileTask, 'saveIniFile')
                   .SetParameter('iniFile', iniFile)
                   .Unobserved
                   .Schedule;
     end;

After reading a few blogs and looking through docs, I found that I needed to store an instance of the task in a persistent variable. Ie...

var
    task  : IOmniTaskControl;

class procedure saveIniFile(const iniFile: TStringList);

     begin
        task := CreateTask(saveIniFileTask, 'saveIniFile')
                   .SetParameter('iniFile', iniFile)
                   .Unobserved
                   .Schedule;
     end;

My question is, should this be a separate persistent variable for each instance of the task?

For example: if I launched the same task from within a loop, would each previous instance would be overwritten by the new and therefore would I need an array of instances?

The examples I have seen seem to use a single variable for all instances created but this seem wrong.

Can anyone shed any light?

Thanks