Isnt the onboard comp enough for adhesives camnz? Who did you buy it off? That's the place for problem solving. Don't like the sound of it though, is the motor clamped down tight enough? Not a usual problem that, even with a jammed r&s the motor should give up well before anything jumps out of connection like that, especially as its only single phase power. Check the ends of the mixing shaft, r&s and the hauling bracket for signs of damage. The L is a new machine though....possible weakness somewhere in the design? Saying that probably something very simple though, good luck