Grammar Checker Not as Good as It Used to Be

I'm an editor, and I've been using MSWord since it took over the market in the 1990s. I have my settings set rather tightly. Yet, this summer I find spelling and punctuation errors that the grammar checker would have caught a year ago. And it's suggested fixes includes more semicolons than anyone uses today.

My gut says that it uses AI rather than whatever engine it used to use.