The bubbling that occurs on the inner liner of the multicooker pot is typical during the formation of the inner liner of the multicooker pot. These marks are acceptable and will not change over time.
The Ninja Multi-Cooker should never be used for deep frying. It can be used for searing and sauteing.
It is perfectly safe to leave the Ninja plugged in ONLY when using SLOW COOK, BAKE, WARM, or Auto-iQ Meals or Grains settings. When using the other settings, you must be present, like when using a stove.
No, it is not recommended to store food in the cooking pot in the freezer.
YES. The pot can go straight from the fridge to the multi-cooker without cracking.