If reviews are showing on your products before but someday, reviews disappear. Please check the cases below to fix your issue.

Your products are disabled in your Ryviu Products section:

Please enable them by clicking on product status icon so reviews will show up on your product page

Reviews disappear on one or some products, not all your products:

If you changed your product handle/permalink of product on your Shopify store/ WooCommerce store, please go to your My reviews, edit product handle of that product to the same with the product on your store. 

If you are using an App to customize your product layout, please add our snippet codes to your app layout to make reviews showing. Here is code snippets:

Stars rating under your product title:

<div class="review-widget">
    reviews_data="{{product.metafields.ryviu.product_reviews_info  | escape  }}"
    product_id="{{product.id}}" handle="{{product.handle}}">
<!-- / RYVIU APP -->

Snippet code to display comments:

<!-- RYVIU APP :: WIDGET -->
<div class="lt-block-reviews">
   total_meta="{{ product.metafields.ryviu.r_count }}"
image_product="{{ product.featured_image.src | img_url: '800x' }}"></ryviu-widget>
<!-- / RYVIU APP -->
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