All of our Kindle case listings are no longer searhc term visible on amazon FR, DE, IT, ES

100's of our brands Kindle Case ASINs, including ones that are 5,6,7,8 years old have suddenly become completely hidden from search results.

Previously if I searched "Forefront Cases Kindle" 100's of our brands ASINs would be visible, now there is not 1 listing visible on all of our European marketplaces. Please can you someone help and explain?