Hi Guys, I have 2012 Macbook pro which runs fine without any issues at all. However when I connect external monitor , after few hours or sometimes earlier, everything slows down and I am not able to do anything. I looked at activity monitor and it seems like Kernal_task ends up using crazy amount of CPU which is causing the slow down. Every thing goes back to normal once I unplug the external monitor. Anyone has encountered this problem before and any solutions?