simonspecialtyps To troubleshoot, You can try to update the following :
1) Template version - Latest version i.e 3.24 as the same comes with several improvements and bug fixes
Upgrade Method:
You can install new version directly over this version. Uninstallation is not required.
2) Php version - Update your PHP version to latest stable version
You can update your php version to latest stable version through cPanel or you may ask your hosting provider to update the same
Would suggest to also take backup of your site before performing aforesaid steps, in case rollback required whilst facing any issues e.t.c