Loop only on mobile

No this is not possible within a single SA slider.

The only way I can think of to achieve this would be to:
– create 2 identical sliders (you can use the excellent ‘Duplicate Page’ plugin to duplicate your slider),
– make sure that both sliders have a different CSS ID
– insert both sliders into your page
– use some CSS Media Queries to display 1 slider above a certain screen width, and display the other slider under a certain screen width.

So your CSS might look like this:

#slider_desktop { display:block !important; }
#slider_mobile { display:none !important; }
@media screen and (max-width: 767px) {
	#slider_desktop { display:none !important; }
	#slider_mobile { display:block !important; }
}