Dell XPS-15 9570 - Issues with USB webcam and keyboard

Hello.

I connected to the two USB type A ports of my XPS-15 9570 a webcam and a keyboard (one device connected to one port and the other one to the second port). Each device works fine by itself. But, when I switch on the camera the keyboard stop working (i.e. while typing, it misses most of keystrokes and randomly replicates some letters).

Any tip is welcome.