How many problems does the product with the most problems have? List the number of the problems and product name.
SELECT count(*) ,  T1.product_name FROM product AS T1 JOIN problems AS T2 ON T1.product_id = T2.product_id GROUP BY T1.product_name ORDER BY count(*) DESC LIMIT 1
En çok problemi olan ürünün kaç sorunu var?Sorun sayısını ve ürün adını listeleyin.