It happens to every site: old, irrelevant pages start ranking again, hurting...

https://stateofseo.com/should-i-301-redirect-old-urls-or-leave-a-404-the-reality-of-content-decay/

It happens to every site: old, irrelevant pages start ranking again, hurting your current SEO authority. This is often caused by search engines rediscovering legacy files from deep archives you thought were long gone