Hey all, I just received my 2nd replacement for my macbook pro retina. The reason I returned the first one was because even though I didn't do anything, the fans were randomly running at full speed for approximately 1 or 2 minutes. However, this issue happened again with my replacement. Does anyone have any ideas what cause this? When the fans were running at full speed, I checked activity monitor. The CPU usage was around 0.5%. If anyone has the similar issue or has solutions, please help me out. Thank you in advance.