Anybody else seeing drops starting around Jan 20th?

I've been seeing it on a couple different clients of mine. They're both eCommerce businesses on Shopify. They operate in completely different markets/countries, and I thought it was maybe some kind of silent link penalty thing for one of them because we've been kind of aggressive, but then I noticed the same exact trend on the other who has a 100% natural backlink profile and where we haven't even worked with them long enough to have built a single link. In both cases, they started a downward trend around the December updates, but then they've just continued going down now for over a month straight with a particular additional drop right around Jan 20th. Anybody else seeing this, or am I just personally f\*cking up something across multiple clients?