My MacBook has been acting wierd for a while now. Every week or so it completly freezes, meaning I can't interact with the system anymore at all: No mouse movement and no apparent response to key strokes. It doesn't just go away either: last time I left it sitting for about 5 minutes, no luck. In the end I have to hold the power button to reboot it.
How can I track down what it is that causes this? Note that I cannot reproduce the freeze.
Some info: I have a Early 2013 15 inch MBP running 10.10.4.