dot in the picture

Hello, I noticed that my sony a6000 developed dots in the middle of pictures. I thought it was something on the lens and tried to wipe it off, but not the case.

In fact, when I zoom in, the dots fade in colour, but also get bigger. But they only appear when on Manual Exposure or on Aperture Priority. All the other modes are perfectly fine.

Does anyone know how to solve this?

Thank you!