I've noticed with a couple of larger prints, that the printer will freeze and just keep extruding. Its not at any specific point in the print. I've had it happen 60 layers in, and 400 layers in. The display doesn't change (still shows "stop" "Pause") but I can't select anything. The only way to stop it is shut it down. I'm running Simplify3D, but I'm not sure that's what's causing it. All I know is, if the print is complex or big, it crashes. Any ideas?