Bought a 15 inch 2017 MBP and am running High Sierra PB2 on it. The few days I've had it I had, very spontaneously, the lower third of the screen glitch out for a split second. I can't even tell what happens because its so quickly. Its not artifacting it just seems like the pixels shift really really shortly. I am not sure if I should be concerned it might be a hardware issue or if its just software based. Again, theres no irregular behaviour other than that. I don't get any artifacts or other display errors. I can't even repeat the error. Sometimes it will happen after an hour, sometimes it won't happen for 8 hours. I do think it mostly happened while I was using safari. Has anyone else encountered this? Could it be related to automatic switching between iGPU and dGPU?