I have the same problem as this post https://forums.nexusmods.com/index.php?/topic/3823790-weird-graphical-artifacts-trees-certain-areas-and-vents/&do=findComment&comment=34783120 and it started with patch 1.3. I only recently reinstalled the game and even with no mods it was happening only much worse than before. I have since installed win7 in a dual boot setup and with nothing but the game and drivers it still happens constantly. I have also installed the game on my old pc and it is doing the exact same thing, using the settlement workbench sometimes causes it but most often it happens as the light changes to dusk, and it always happens when it rains or if I use the robot workbench. GPU's tested - amd r9390 with no o\c and amd r9280 that has a mild o\c, different driver versions are not making any difference. Possible solution for amd using crimson drivers - Open Radeon settings control panel go to gaming tab, use global or fallout4 if you have it setup in the gaming tab, turn off surface format optimization, if this doesn't help then change texture filtering quality to performance. I made both of those changes together so I'm not sure which but the problem has not shown up again since and the blurring textures on the load screen also stopped. I tested with crimson 16.4.1