There you go.
https://drive.google.com/file/d/1AmgNNO7vrSmJ0lQEYuPyKEyXHOVvkJJI/view?usp=drivesdk and this is the screen record.
Anyway, there is no visible error, crash or something, just frame drops. Maybe the governor is trying to keep low CPU/GPU frequency, while recording video? Just as my hypothesis...
When screen recording is disabled, FPS is a little bit better, but it's still looks stuttering.
When I use a hypersteady mode, it looks smooth, as well as it must be, but for 60 FPS it only supports full HD resolution.
Yep. It is not related to phone's temperature. When I use third party app to record 4K video, like Google Camera, it records video smooth, even with EIS enabled, because it uses its own EIS algorithm. But the only reason, why I want to use stock camera app, is 60 FPS support. Third party apps cannot record 60 FPS videos unfortunately