My brand new (today) UD-5900 worked fine initially, but now has failed 3 times in the last several hours. Using it with a Lenovo ideapad FLEX 4-1570 laptop and two Dell E207WFP displays. Also connected to Ethernet and wireless keyboard and mouse. When it fails everything but the keyboard and mouse fail. Disconnecting it from the laptop and from power allows it to start working again, but the last time it only stayed working for a minute.