My Mac has started to stutter horribly when listening to music or watching video on YouTube, somewhat arbitrarily. I'm a music producer and it's especially horrible in Logic, causing absolutely MASSIVE CPU spikes and makes it absolutely useless to work in. In Logic it stutters every few seconds. I'm not the only person reporting this - what gives? Any solutions? I'm also experiencing intermittent WiFi outages where my iMac states it's connected to WiFi but has no internet connection.