Opera soap with Ubuntu 18.04

I have an Intel NUC connected to a 42 inch LG TV. I have been using Ubuntu with Unity for several years. The image quality was good for both videos and for Netflix. Recently, I updated to Ubuntu 18.04. Now, videos and Netflix have the soap opera effect of motion tweening. They look cheap and ugly. Is there anything I can do? Or should I reinstall Ubuntu 16.04? Ubuntu 18.10 does not solve the problem.