This is my 3rd NutriBullet. I have always been very please but this time the liquid cup would not stay in the base when on. The plastic
clips were very stiff. I did call customer service to return and they walked me through how to condition it with soap and water with a toothbrush so I we dis get it to work. I think when you purchase something new it should work so maybe quality control?!  Otherwise, happy it works again as I always enjoy using their products for nut milk and smoothies.