Most of the time it is due to windows updates using Background Intelligent Transfer Service (BITS) .. BITS uses binpath= “c:\windows\system32\svchost.exe -k netsvcs”.. Simply by disabling windows updates or by disabling BITS service you can get rid of bandwidth eating. But disabling Windows updates is not recommended, since windows operating system updates /security updates will protect your pc from known vulnerabilities that are discovered time to time. You can use third party utility to limit/schedule downloads as you wish.