phpbb randomly throws up 'Internal Server Error'

Since starting my phpbb board a month and a half ago my users and I randomly come up with a 500 - Internal Server Error executing any php script on the site. ( http://forums.burfstar.com if you care; it's a private forum though...)

I have triple-checked my permissions to each folder and file, and all of them are correct.

All scripts cause the error, but refreshing the page always fixes the problem (If a user posted a reply to a topic, it calls posting.php and sometimes it displays a 500 error, refreshing shows the correct posting.php and the reply is posted).

I have checked and posted in the phpbb support forums for a solution, but have found none.

Here is a copy of the error message in the log file:
[Wed Mar 03 02:52:35 2004] [error] [client xx.xx.xx.xx] Premature end of script headers: php-script
[Wed Mar 03 02:52:35 2004] [error] [client xx.xx.xx.xx] php-script: line 4: 3335 Segmentation fault /usr/bin/php

The things I can think of that would cause this, and I would appreciate you saying something if you think otherwise, are either incorrect server configuration, server does not like when @REQUEST_URI is used (or something similar) or I'm somehow overusing the CPU or RAM allotted for my account on the server by running my board of <50 members (I use canaca.com for hosting).

The error is random, and does not come up all the time. Refreshing always brings up the correct page.

I'm going to be back later this evening, so excuse my lack of answers for a few hours if someone replies before then .

Hmmm... I get that sometimes. Ususally it happens to me when my PHP script does not output anything. I fixed this by making sure that there is some raw HTML on the page (HTML that is NOT enclosed inside of the <? and ?> tags)

If you are using a 3rd party to host your site, you might want to ask them (if this dosen't help).

Hope this helps.

Can someone give me an example of what I should put and in what files, please? I'm thinking functions.php or sessions.php since those are called at every page. When I try to do what you asked, I get a header already called error.

I have contacted my host and they told me to check my permissions .