A problem with ajax that is hard to reproduce

I am ajax loading some html using javascript. Occasionally, instead of
my responseText from being sent, the action send back the entire page
with a flash message - request error. Imagine how funny it looks when
it gets loaded into a div. This is very hard to reproduce. It usually
happens once in a while.

This is my action in question --

/**
* This interacts with my formbuilding js - its the view that does
the trick here
*/
function buildform() {
if ($this->RequestHandler->isAjax()) {
configure::write('debug',0); //I am not a noob :)
[hopefully]
$this->layout = 'ajax'; //I tried this and the problem
occurs 1/20 atttempts
//$this->autoRender= false; //I did this first with no
view file and the problem occurs 1/10 times approx
$result = $this->{'_render'.$this->params['named']
['action']}($this->params['named']['type'] , isset($this-
>params['named']['id']) ? $this->params['named']['id'] : null);
$this->set('result',$result);
} else {
$this->Redirect->flashWarning('Request Error');
}
}

My buildform.ctp does an echo of $result which basically is a string
of html markup.
As you can see Ive already tried a number of things in order to
prevent the problem from recurring but am fresh out of ideas.

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