Daily Chinese Idiom Guessing Game
It is not surprising because it has been seen many times; common occurrence.
屡多次；鲜新鲜，新奇。常常见到，并不新奇。
《史记·郦生陆贾列传》一岁中往来过他客，率不过再三过，数见不鲜，天久慁公为也。”
Such complaints are lǚ jiàn bù xiān in customer service.