Proform 740 CS Treadmill?

I've had this treadmill for 8-9 years. I used to use it more, then not so much. I just started using it again today and in the middle of a program and even if I'm on manual mode, all of a sudden it just stops dead. The power stays on and the lights are lit up, but the belt itself just stops so unexpectedly and you could actually get hurt. Has anyone else had this issue??