Hi Daniele! I hope you’re well 
When you try to access Live View is this always when you are NOT home and it doesn’t work or does it not work when you are home as well?
As far as the motion settings go, I would take a look at your zones and see if you’re able to exclude where the cat walks by. Although, it says ‘People only’, I have noticed the device still picks up creatures like cats. We are working on continuing improving our products, so I appreciate this feedback and your patience!