Wordpress 500 Errors and "Premature end of script headers"

Hello,

This morning (6/24) at 6:25 am, I suddenly started getting 500 errors on all the domains on my Linode (most of them have wordpress installed, but even the ones that don't are getting 500's). My most frequently trafficked domain is offmetro.com, and I checked the apache error logs and found the below errors:

[Sun Jun 24 06:25:17 2012] [warn] client 66.249.71.58Connection reset by peer: mod_fcgid: error reading data from FastCGI server

[Sun Jun 24 06:25:17 2012] [error] [client 66.249.71.58] Premature end of script headers: index.php

[Sun Jun 24 06:25:17 2012] [emerg] mod_fcgid: server is restarted, pid 5815 must exit

[Sun Jun 24 06:25:33 2012] [warn] client 72.46.130.42Connection reset by peer: mod_fcgid: error reading data from FastCGI server

[Sun Jun 24 06:25:33 2012] [error] [client 72.46.130.42] Premature end of script headers: index.php

[Sun Jun 24 06:25:38 2012] [warn] client 66.249.71.58Connection reset by peer: mod_fcgid: error reading data from FastCGI server

[Sun Jun 24 06:25:38 2012] [error] [client 66.249.71.58] Premature end of script headers: index.php

[Sun Jun 24 06:25:39 2012] [warn] client 85.17.156.11Connection reset by peer: mod_fcgid: error reading data from FastCGI server

[Sun Jun 24 06:25:39 2012] [error] [client 85.17.156.11] Premature end of script headers: index.php

[Sun Jun 24 06:25:40 2012] [warn] client 85.17.156.11Connection reset by peer: mod_fcgid: error reading data from FastCGI server

[Sun Jun 24 06:25:40 2012] [error] [client 85.17.156.11] Premature end of script headers: index.php

These errors are still continuing as we speak (and also show up on the other domains). Most of my domains have wordpress installed (including offmetro.com). What I find really strange is that I restored my linode to a period of time before I was getting these errors, and then I still go the errors. I am still able to access my site via FTP and phpMyAdmin still works. I just get 500 errors on every page on every site on my domain.

Anyone have an idea what could be causing this sudden issue?

Thanks in advance for the help!

Vince