I haven’t heard of any changes to the focus – pretty sure it would have been in the March update if so.
When you say “auto focus” do you mean the auto focus that happens when you hit Print, or are you referring to the “set focus” feature? Set focus will make sure your focus point is on your material, and not ending up off the edge or in a hole in the material. That could be the issue, depending on what it is you’re working on
Only other things I can think of are to make sure the windows on the bottom of your head are clean and there’s no bright external light shining into the machine.