Internal Server Error on saving theme options on IDStore theme

Hello,

We are getting an internal server error on saving the theme options page.

We have checked the error log which shows this:

[Wed Jul 29 20:26:16 2015] [warn] [client 217.137.225.85] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server, referer: http://justincase.consil.co.uk/wp-admin/admin.php?page=ot-theme-options
[Wed Jul 29 20:26:16 2015] [error] [client 217.137.225.85] Premature end of script headers: options.php, referer: http://justincase.consil.co.uk/wp-admin/admin.php?page=ot-theme-options
[Thu Jul 30 12:18:15 2015] [warn] [client 80.82.113.220] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[Thu Jul 30 12:18:15 2015] [error] [client 80.82.113.220] Premature end of script headers: wp-cron.php

Any ideas of why this is happening when saving the theme options?

Thank you.