Hi Johannes,
Thanks for reaching out, and thanks for using BoldGrid’s WordPress Themes. Sorry to hear about the disappearing social media icons in your footer and we are happy to help you get them working again!
It seems like the problem with the social media icons is coming from the Flexi plugin installed on your website. Flexi is loading its own version of the FontAwesome library that overrides the one used to display the social media icons in the Westview theme. Deactivating Flexi should get the icons in your footer displaying properly again.
Please let us know if you have any other questions for us!