Question about Roborock S5 Max

I've had my Roborock S5 Max for almost a year now and I'm really happy with it. However, for the past month I have been experiencing a problem. The software is up to date, the sensors are cleaned, it knows where it is on the board. But when I ask it to do only one part, it does them all every time, whereas until now I have had no problems. Have you had this problem? How do you remedy it?