Chosen Solution

Why is the roller brush not going around. Could the belt slip off?

If your Shark vacuum stops moving suddenly during use, see the Shark ION Robot R75 Stops Moving Unexpectedly problem page for possible problems and solutions. Use this guide to help diagnose the issue: Shark NV352 Roller Brush Replacement

broken belt follow this video https://www.youtube.com/watch?v=zkDeWuXb