ActionScript 3.0 :: Sometimes Timer Doesn't Execute

I have a function in which all items of an array are processed. in part one of the code I have a certain function called immedietly for ever item, but after that, a function is made within this function, to be added to a timer. the function will be executed 500 milliseconds later. this works fine most of the time, but sometimes the function with 500 mill delay doesn't get executed at all, while the first part does.

Can the cause of this problem maybe be, that there is a limit to the amount of Timers, or nested functions?

This is the function:

PHP Code:

if (ballsWillBeMatchedOut.length >0)
{
//part one:
for (i = 0,num = ballsWillBeMatchedOut.length;i<num;i++)

[Code].....