WooCommerce Data Updater – erratic white pages

I have just updated Woocommerce to the latest version. Now, the “shop” page is behaving erratically; sometimes only one product shows, sometimes all 8. Also, the products can display correctly, or be a completely white page without even the WordPress control bar. Again, this is unpredictable.
Is there an easy fix for this, please?
Thanks.
Derek