The problem occurs whenever we're making or receiving a call, and one of our computers is online and transmitting data (e.g. browsing internet, downloading a file, watching Youtube). The phone call slows down and keeps dropping out, to the point where conversation is impossible. All of our computers are connected wirelessly to the Linksys WAG54GP2, including a desktop, a laptop, an iPhone and an iPad. We also have our TV and Blu Ray connected to the Linksys via ethernet. To "solve" the problem, we have to stop whatever online activity we are doing, at which point the call goes back to normal.
I suspect it is something to do with QoS settings, but I wouldn't know where to start to try improving things. Is there a simple fix which I can apply when I get home, or is this something I need to call the helpline for?