Hello b. I have noticed exactly the same thing with my FZ2000. But for me it is also with the setting P. I have not yet found out what the reason is. Spontaneously I would think that the automatic exposure is often overloaded with high contrast (sun / shadow). When I have found a solution I will write it here again.
For landscape photography, you can focus on a bright area so that you like the lighting conditions. Hold the shutter release button down lightly, select the image section and then release the shutter. Jürg