the problem with the textures. (ARK: Survival Evolved)

People, there is such garbage - I play solo on some maps Ragnarek, Volcano, Extinction when traveling on the map, after some time disappearing textures of resources (ie not rocks/trees/crystals/herbs sometimes you can get into texture maps) because of what may appear to be the problem? not enough memory? I cannot load the old map? you have to go out and go over that with a local server takes a lot of time. tried to lower the settings, but the problem happens on low. I'm sick of.