I posted before about visuals and sound freezing for around 10secs and then leaving random textures. Well, after updating to 69 and trying the F3.5, which I hadn't really driven before, it was hanging every lap. This was good because I could do some tests. I'm now pretty certain its the shadows causing the problem. With shadows off and even everything else maxed, it's fine, but with low shadows it'll freeze and randomise the textures. I've got to say as well that with all those flickering shadows gone, it looks generally better too!