What problem? If you have two Roamios or a Roamio and a Stream in the same network this is normal; you just pick one or the other to stream from. (If you have the former situation, you should uncable the Stream and sell it on eBay because the stream in the Roamio will be more reliable.)
If that is not your problem you could try describing your issue in more detail. Like exactly what TiVo boxes you have in your home network, are you stealing your neighbor's WiFi, stuff like that.