edit2: see my second post edit: I reset SMC, NVRAM, used Web recovery, erased disk, Web recovery installed Sierra, then install HS through Store, and so far no problems. Really weird. Can anyone with mbp 2015 13 and High Sierra start watching the following video at full screen (no UI elements visible) and video quality set to "Source" and see if they have any issues? https://www.twitch.tv/videos/243932818 Whenever I watch certain video streams on Twitch in full screen with Safari I get weird artifacts, and the laptop eventually freezes. Sort of like this: It might take a couple of tries or around 30 seconds before video starts acting weird (flashing, gamma changes, artifacts). No issues with youtube, 3D games, diagnostics, anywhere else (apart from maybe Premiere Pro crashing, but not sure if it's related). I'm just curious if others have this problem with the model and OS or if it is a bizarre hardware failure.