Slider issues with phone-site and larger displays

Hello,
Thank you for providing such a beautiful theme! My clients love it.

The site I built with Graphy (child theme) is here. We are experiencing a couple of issues with the slider.
1) On phones, the slider is not resizing responsively to the smaller display and so only a portion of the image(s) is visible.
2) My client tells me that on larger displays (desktop rather than laptop) the slider does not automatically scroll like it does on the other displays.

Any idea what could be causing these issues and how I can solve it?

Thank you so much in advance!

All the best,
Ana