I have an iPhone X mounted in my vehicle. The mount is a Pro-Clip but I have had the same problem happened with multiple styles of vehicle mounted phone holders. I have also had it happen with other iPhones that i have owned. Basically, when I try to record a video with the back facing camera in the vehicle is running/driving down the road the video has a wavy effact that happens to it. If I switch to the front facing camera I do not have that problem. The only thing I can think of is the slight vibrations of the vehicle cause the optical image stabilization to go wacky. I have tried looking for others with this problem but have not been able to find anyone else… It may be that my Google-fu is weak. Has anyone else seen this problem or have any suggestions on how to fix it? I have had it happen with hard mounts to the dash, ram mounts, and windshield suction cup mounts.