Your @font-face CSS is pointing towards font files in the parent theme. When you update the parent theme, WordPress removes the folder and uploads the fresh folder.
Thank you for your prompt response. I have added the font files to my Font folder in the Cpanel. It still does not show custom fonts. I have no idea how to set up the Child Theme
*Update: I now see that I needed to add ‘assets’ to the url. Resolved.