Win11 Dark Mode Keeps Changing to Light Mode

I have a Lenovo Yoga laptop.

I’ve set my Win11 laptop to Dark Mode (Windows Settings, Personalization | Colors, Choose your mode, Dark). It works correctly at first, but every couple days or so, it mysteriously changes back to Light mode. No matter how many times I change it to Dark mode, it keeps resetting back to Light mode every couple days or so. It’s very annoying.

Does anyone know how to fix this?