Cameras have their own unique personalities.
When you buy a new camera chances are you find it takes a little while to get used to it. Little by little you find the buttons and menus and learn how they work. After a little while you get comfortable and feel like you know it fairly well.
But it will keep surprising you. You learn new things about it and how it acts.
Then the better you get to know it, you discover even more nuances. It has quirks that weren’t necessarily designed into it. Quirks you never noticed or that did not bother you before.
And then as it ages, it changes some more.
Good thing people aren’t like this.