Fragile/defective cable
Bought in July 2019 the power connection proved to be very unreliable in the autumn and by spring 2020 I was reduced to reconnecting all the pieces more than ten times before I got power.
Finally I bought a cable (belkin) and everything is fine, so it's only the cable that was causing short circuits and loss of connection. The protection against short circuits and problems on the PC and charger side worked well because these recurrent failures did not damage anything.
I have to admit that it is compact, powerful and very versatile without any noise.