Boyd's getting a lot less chase over the last month or so than he was getting prior. Pretty much everything else such as velo, contact rate, in-zone rate, first strike rate, etc. is flat. Hell even his pitch type usage is more or less the same.
My guess is it's a gameplanning thing. We're now a little over a year into Matt Boyd 2.0, he's probably just gotten a little predictable and needs to change things up.