Two XPS 9300 next to each other - Keyboard/Mouse stops working

Hey guys,

i have currently two XPS 9300 at home using for my job.

When i close one XPS so that it goes into sleep mode and put the other XPS on top the keyboard and mouse stops working. If i remove the XPS again it works again.

What could be the reason for this? Are there some radio waves or something that are interfering with each other?

Kind regards,