Internet disconnects when 2nd computer is connected

Potato - Updated by Ambucias on 8/01/17 at 04:26 AM
as said in the title, only my internet is disconnected when a particular computer connects, while other devices remain connected. When said computer is connected to the internet, my computer will disconnect at random times and then reconnect a few minutes later. The only solution I've found is temporary, and that is to disconnect that computer from the internet.