I had the same problem. Cleared video cache, etc and still pixelated. Some suggested the Litchi and that worked. It's very similar to DJI Go but only takes up about 40kb. Try it. FYI it cost 22.00. A little pricy to try out.
I bought a Samsung Galaxy Tab A 6 to use with my Phantom 3 pro and the video stream is pixelated. Any suggestions would be great. Brand new to the forum.