The 360 would stop downloads when you played online. I've had several instances when I'm playing online games (Battlefield 4 and COD:Ghost) when it would get extremely laggy. I'd check my network to discover that the Xbox is in the process of downloading something (i have no idea what...apps doesn't show anything updating) It will either stop on it's own or stop when I reboot the box. Why is it doing this????
Last time (about 20 min ago) it was running at 4Mbs until I hit the power button (low power mode). Then it stopped.