Have you already updated your OS? Set your Macbook to YCC colour format instead of RGB (try all the possibilities it has there) ? Performed a reset on the monitor ? Have you tried a different, higher quality cable (USB-C to DisplayPort)? A docking station with DP connection would probably be the best solution. Here is a tool that usually solves all monitor problems with MAC: https://www.madrau.com/srx_downlo...