Shimmer textures + dives in place. (The Witcher 3: Wild Hunt)

Guys, help. I have a problem for which it is impossible to find a solution on the Internet, even there are no suitable ones.
I start playing and after that, Gerald starts diving out of the blue, supposedly diving into the water, but he himself stands on the ground + flickering textures are visible in the distance, huge white squares with blue stripes, and all the time after these flickers he dives with me. There is generally a black screen after that and it turns out to be in another place, or underground but floating somewhere.