NutriBullet turns for only a few minutes

My nutribullet only stays on for a few seconds when I attach the cup to the base. It suddenly stopped turning on the other day and now it does not stay on even when pressing the cup into the base. I noticed some small metal balls came out of the base and the motor had a slight burning smell as though it was overheating. There is also a crack in the plastic part of the base that attaches to the blade on the cup base. I am wondering if anyone has had a similar problem or if anyone believes that replacing the cracked piece will fix it or if I should just buy a new one. Thanks!