jQuery 1.4.2 - Ajax & increasing IE 8 Process Handles

I'm requesting every second some data over $.ajax.

$.ajax({
   type: "POST",
   url: "ServiceEndpointUrl",
   data: "",
   success: function(result) {
      ... Do Work ...
} } } } });

This code leads into an continuous growing number of handles in IE 8 (Windows 7 / verified with Task Manager & Process Explorer).

Firefox & 开发者_开发知识库Chrome does not have this problem.

This page is displayed all day long - this leads into thousands of handles & will sometimes crash the complete browser.

My workaround is to reload the complete page every hour - but this can't be the solution ;-)

Any suggestions how to "close" these Ajax-Handles?

thx