Eclipse editor stops accepting input

Question

I am using Eclipse for PHP projects. I use the Project Navigator to create a new PHP file. I give it a name and it puts me in the editor with one line that has <?php. All good so far. So, now I enter a line to declare a function, or a class for that matter. I get to where I enter the { to start the function block and eclipse editor stops accepting input. It looks like this:

<?php
function sol2($n) {

At that point it won't accept input. I can't enter a newline or even backspace. I click around trying different stuff and eventually I get complete control back. It seems if I don't do anything for like a minute I get control back. After I get control back I can create more functions or classes with no delays.

Is there some setting that is causing this initial delay?

Thanks Chris K