Texture in distance is multicolored

Game launches normal and after about 20 minutes of gameplay the textures around the player turn these colors. The only normal textured blocks appear in a 16 to 20 block area around me. Two of the attached screenshots have the F3 info. If I exit the game and close the launcher, the game starts normal again until play for another 15 to 20 minutes then it starts again. Any help with this is greatly appreciated. Thanks.