So me and my flatmates share a broadband connection through router. Before subscription we all came to an understanding that no one will download data during day time in order for others to surf web without any problems. But since past few days someone has been secretly downloading and I can't even open gmail. Upon asking everyone denies plainly. Thrice I've changed the password after which everything goes to normal but after telling those jerks the password same thing happens. Is there any way to find the culprit? After logging in router I can see the clients connected and everyone is accounted for. I just can't see who is hogging up the bandwidth. My router is dlink 605L. Any help is very much appreciated.