Hi, I was noticing the screen on my 2015 rMBP will go black for a second every once and a while. It is very similar to when I plug in an external monitor and the screen goes black for a second before directing output to the monitor. Only it is exhibiting this behavior when I am surfing the web, running applications, etc. It happens maybe once a day or so, and I cannot detect a pattern based on usage. Any ideas.