[System] Kubuntu seems not to receive my UDP messages

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http://www.kubuntuforums.net – I'm using an app on my smartphone which sends audio data in the form of UDP messages. I'm trying to receive the data on my laptop, which has dual-boot Windows 7 and Kubuntu 13.04. When using Windows, I can always see the UDP data being received using a tool like NetMon or Wireshark. In Kubuntu, very occasionally I see the data in Wireshark, but usually it doesn't seem to work at all. When it does work, it only works for about 5 minutes after booting. After that point, I seem to stop receiving the data. I'm totally mystified by this and not a bit frustrated. My understanding is that Ku (HowTos)