I have an 07 Volvo with a d12 465 horse . engine will shut down while I am driving.i can turn switch off then turn switch back on and restarts.it will do this intermittently.sometimes every couple days and sometimes will go a couple of weeks between stalls.anybody have any idea what the problem is?

My Freightliner was doing that. It was the water sensor and if I turned sharp or went up or down a hill it would slosh the water away from the sensor and shut down. Once level it start back up.