Tried it with my other laptop (dual core AMD). Same issue, stopped about 3-4 mins into a 6.5 min print (MatterControl default calibration cube). All default settings except 4 skirt loops to prime the nozzle and having no G29 offset. This time I did get a MatterControl error message. Under the printer it is connected to it says, "Connection Lost. A device attached to the system is not functioning." The BW Pro board never disconnected according to Device Manager, and Windows still reports it as working properly. I'm using MatterControl 1.2.2, which is the latest version. And updated the BW Pro FW to the mid Jan release in the first post of this thread. I have a Belkin Gold cable coming (be here Friday). Cheapest cable that didn't look like crap at Best Buy was $30. No thanks! I'll wait a day for that price. My mini-prints are looking great though with default settings.