Pagination (page/2/) displaying 404 on archive pages

Found the answer!!!

Put this in functions.php (or a required file). Of course, change it to suit your needs. I needed something that only worked for product category archives.

function modify_product_cat_query( $query ) {
  if (!is_admin() && $query->is_tax("product_cat")){
       $query->set('posts_per_page', 2);
  }
}
add_action( 'pre_get_posts', 'modify_product_cat_query' );

I also took out the posts_per_page parameter from my WP_Query.

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