Just did it printing a test STL using Cura. half way through I came back and it was frozen. Hotend still hot and fan running. LCD says Printing and Cura says Printing. I can Pause the print but nothing happens. All I can do now is Cancel the print and it does.
Printing via SD card works perfectly which is what I've started doing (I'm actually liking it better despite the extra steps).
When I print via USB is when it randomly happens. I've been reading up on it and I'm probably guessing it may be power spikes in my outlet which I wouldn't it doubt it in my old house.