I bought a new MBP 2017 just over a week ago. Everything has been running fine, but lately, sometimes when I turn off the computer, the screen will go light green for a few seconds and then power down. I've also noticed that in startup, about halfway through the screen does a quick glitch and then loads up. Everything on the computer seems to be running fine, it only happens in start up and shutting down. I did a clean install this morning but it still happens. Anyone know what could be happening?