I am using IQFeed for the past 4+ years and it worked fine, during most of the time, pics of data included. However, during the past month (september 2015) I had few reliability problems with IQFeed. Mostfly during European hours or weekends or during US pre market hours.
So I am considering to leave IQFeed. I use SierraChart, so consider their feed, at least temporarily. Rithmic is also know to be good for price AND orderflow.
If your problems occur during pics of data, be sure it is not your platform. For exemple, MarketDelta/IRT hang on me regularly on high data volume. Had same issues with Ninja, less often. Never with SierraChart.
-- W.