Wireshark traffic

Hello, in my Homenetwork one of the Internet Devices is using sometimes the whole down or upstream. I can't find this one and it don't want to shut down in this time every single device. I know its an Wlan device because everytime i shutdown the Wlan downstream goes back to normal.

is there a possibility to show in wireshark which device is using the most traffic? Or to which ip it is adressed.

i got the file from http://fritz.box/html/capture.html

Perhaps something like this:? http://bandwidthd.sourceforge.net/demo/

Thanks a lot