Re: Screen sticks every few minutes
That's X11 eating all the CPU.
-0 -auth /var/run/lightdm/root:0 -nolisten tcp vt7 -novtswitch -background none
Your ~/.xession-errors file might contain a clue. You should definitely investigate your X server configuration, could be a driver issue. You should also disable composition and see if that help: Settings->Window Manager Teaks->Compositor->Disable display compositing.
husband@wife$ make sandwich
husband@wife$ sudo make sandwich