I doubt that this is a bandwidth issue because unless you have some sort of QoS for your multicasting, the news simply doesn't get dropped over the price update. The 3 minute time limit when the news traffic drops sounds like a dense mode problem with the flood-prune every 3 minutes. Are you running PIM Dense, PIM SM, or PIM DM-SM? You need to check the DR of the client end to see if it's still subscribing to the news mcast group when your news feed stops.
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