I'm having a problem with ink dropping out completely. The printer sat overnight without printing and when I came in this morning, almost all the color was gone when I printed the printhead test plot. Did a cleaning and they all came back. The black is the worst, it will drop out completely in the middle of printing. I've replaced printheads, new inks, new print head cleaning kithttp://www.amazon.com/dp/B007WM65DU/. Not really sure what else to do. Seems like a loss of suction, like something is letting air back up into the lines but I'm not real sure how to start troubleshooting that.