I have one device (Macbook pro) that disrupts the internet for all other devices on the network. If I ping www.google.com and the router IP when the rogue device isn't connected it is rock solid for hours on end. As soon as the rogue device joins the network it pings to the router still work fine (so I don't think it's a wireless issue) but the pings to www.google.com start failing sporadically on all devices on the network. It will work for a minute or so, then stop, the start again. After disconnecting and reconnecting from the network the rogue device is fine for a minute or so before shit starts breaking. All devices are set to obtain IP addresses automatically and I can confirm that there are no IP conflicts. DNS servers are also just set to automatically and all devices are picking up the router's IP for the DNS server. What am I missing. Would could cause the internet on all device to suddenly bork itself when one device comes online?