My wife and I run EtreCheck once every two weeks to check the general health of our Macs. Today, on her two-year old MB Pro, running the latest version of Yosemite, EtreCheck, under Top Processes by Memory, had kernel_task 5.69 GB, all in red, indicating a problem. When in the past something had been hogging memory, we could go to Activity Monitor and choose and then quit the offending application. This is not possible with the process kernel_panic. Any idea of what would cause this? I presume restarting the MB Pro would fix it? Many thanks.