Apple TV image flicker in and out

I'm experiencing a strange issue with my setup. All my components, including my Apple TV 4K, are connected through my VSX-LX305 receiver. I use CEC to control everything. Occasionally, when I turn on the Apple TV, the video signal cuts in and out. For example, today I got home, pressed the power button on the Apple TV remote, and everything powered on as expected—the TV, Apple TV, and AVR. However, the Apple TV's screen kept flickering on and off. The only way to fix it is by hard rebooting the Apple TV by unplugging it. I have a Sony Bravia 900F, so everything in my setup supports Dolby Vision, and all my HDMI cables are 48Gbps. Has anyone else encountered a similar problem?