I am playing Feed The Beast mod pack. I built the regular quarry, not the quarry plus. I placed all 4 markers at the end of each blue line, then right clicked the square to make it turn red. I placed the quarry in the corner, connected power to it, it turned on and I show the black /yellow frame that starts clearing the quarry site with the the robot. After a few minutes of running the quarry just disappears like it was never there. There is no game crash that happens when it does this.
Has this happened to anyone else or any idea what might be causing it to disappear ?