I have a problem and my family has a router but we have issues with it that seem that a device is downloading or slowing the internet down. I keep wondering if its my Windows 8.1 computer or software I have installed and its doing something when im not using my computer, but I dont know what it could be as I have even disabled services also.
If this just suddenly occurred, have your ISP run a line test to validate the problem is not on their end or in a connection to your home.