500 internal server error very slow since update

Hi,

Since recent updates I’m having trouble with WooCommerce on a website I am creating. The theme is build from scratch and I have updated it to fit the new Woocommerce update. The website has become very slow and I get a lot of 500 internal server error’s when using the woocommerce part on the frontend of the website. I use WooCommerce in combination with WPML.

The website is build in dutch and english. The dutch part of the store gets the 500 errors en the english part of the store works but the layout is all messed up. Before the update the website ran normally.

Can anyone tell me what I might be doing wrong?

### Serveromgeving ###

Home URL: https://www.sintimusic.nl/wordpress
Site URL: https://www.sintimusic.nl/wordpress
WC Versie: 2.1.2
WC Database Versie: 2.1.2
WP Versie: 3.8.1
WP Multisite Ingeschakeld:Nee
Webserver info: Apache/2.0.46 (CentOS)
PHP Versie: 5.2.4
MySQL versie: 5.5.34-log
WordPress Memory Limit: 96 MB
WordPress Debug Modus: Nee
WP Taal: nl_NL
WordPress Max Upload Size:10 MB
PHP Post Max Size: 20 MB
PHP Time Limit: 30
PHP Max Input Vars:
SUHOSIN geinstalleerd: Nee
WooCommerce Logging: Log map (woocommerce/logs/) is beschrijfbaar.
Standaard tijdzone: Standaard tijdzone is UTC
fsockopen/cURL: Uw server heeft fsockopen en cURL geactiveerd.
SOAP Client: Uw server heeft niet de SOAP Client klasse ingeschakeld – enkele gateway plugins die SOAP gebruiken werken mogelijk niet zoals verwacht.
WP Remote Post: wp_remote_post() is gelukt. PayPal IPN werkt.

### Locale ###

decimal_point: .
thousands_sep:
mon_decimal_point:
mon_thousands_sep:

### Plugins ###

Ge?nstalleerde plugins: WooCommerce (nl) door Pronamic versie 1.0.1
Installer door OnTheGoSystems Inc. versie 0.7.1
Meta Slider door Matcha Labs versie 2.6.3
NextGEN Gallery by Photocrati door Photocrati Media versie 2.0.40
WPML Multilingual CMS door ICanLocalize versie 3.0.1
The Events Calendar door Modern Tribe
Inc. versie 3.4.1
User Role Editor door Vladimir Garagulya versie 4.10
WooCommerce PayPal Express Gateway door SkyVerge versie 2.3
WooCommerce Multilingual door ICanLocalize versie 3.2.1
WooCommerce door WooThemes versie 2.1.2
WooThemes Helper door WooThemes versie 1.2.2
WPML Media door ICanLocalize versie 2.1.1
WPML String Translation door ICanLocalize versie 2.0.1
WPML Translation Management door ICanLocalize versie 1.9.1

### Instellingen ###

Forceer SSL: Nee

### WC pagina’s ###

Winkel basis: #218 – /en/store/
Winkelwagen: #237 – /en/store/winkelwagen/
Afrekenen: #238 – /en/store/afrekenen/
Mijn account: #239 – /en/store/mijn-account/

### WC taxonomie?n ###

Bestelstatussen: cancelled (cancelled)
completed (completed)
failed (failed)
on-hold (on-hold)
pending (pending)
processing (processing)
refunded (refunded)

Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

### Thema ###

Thema naam: Sinti Music
Thema versie: 1

### Templates ###

Template overschrijvingen:No overrides present in theme.

https://www.ads-software.com/plugins/woocommerce/