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Hi Jyotiranjan! As you know, domain authority is just an internal metric, like many others, developed by SEO tools like Moz, Ahrefs. These are known to fluctuate with time and isn't used as a ranking factor per se: https://www.searchenginejournal.com/domain-authority/246515/ While it can be worrying, did your • Overall traffic drop? • Ranks go down for various pages? • Conversion rates dip? • Bounce rates increase? If these are impacted severely, then there's a cause of worry. The update is just rolling out, and there's still time for visible effect on many sites; it's best to monitor the website in the coming weeks. Cheers! 🙂

Feeling nostalgic! When I was new into SEO, I was panicked the same way when our spam score spiked. But yeah, as @Aiswarya Menon said these DA/DR/AS are the metrics from third party tools. As long as your rankings are stable there is nothing to worry about.