I'll be playing, maybe in the build mode, maybe in the middle of a mission, and my whole PC will freeze (I can switch to chrome or firefox tabs, but they don't move, though they do play audio.) for a three to eight seconds, then the screen will go black for half a second to two seconds, and then I'll still be able to input controls for stormworks and the other tabs I have open will unfreeze. But the screen for stormworks is still frozen, so I usually spawn my creation and use the autosave feature to load aup where I left off. It doesn't seem to be following any rhythm, sometimes it doesn't happen all day, sometimes I try to boot up stormworks and it happens twice in a few minutes. I play with about seven kilometers render distance, FXAA antialiasing, etc. with most settings on medium. The only setting I have on high is shadow quality.