PHP help!

I have combine Flash (5) with PHP.
In the PHP I tell it to fwrite to a .txt document.
And in Flash I tell it to load the .txt document.

The problem is that when the php script has fwrite so the size of the .txt doc is about 1.3 kb large (about 1350 signs) it stops fwriting to the doc.
And i ask why!? It´s really annoying.
This is the php script i use:

$var=$HTTP_GET_VARS[“namn”];
$var2=$HTTP_GET_VARS[“com”];
$var3=$HTTP_GET_VARS[“hem”];
$eh = "
<p><b>Name:</b>$var
<p><b>Hemsida:</b>$var3<p>
<b>Comment:</b><p>
$var2<p>
";
$fop = @fopen(“guest.txt”,“ab”);
fwrite($fop,$eh);
fclose($fop);
echo “&check=2”;

It really works great until it reached 1.3 kb.
Please help me!.
PS. I´ve tried with fputs allso. Same problem there.

/ZeusVL