I have a UD-3900 (bought a year ago, unboxed and started using 4 months ago). I am using it with a Lenova Yoga 2 (i7, SSD, Windows 8.1 - Classic Shell).
I am running 2 monitors. One is is connected DVI, the other is connected to the HDMI port via a VGA/HDMI adapter.
About 2 months ago, the monitors started to drop out intermittently. It became more frequent. While it affected both monitors, it affected the one connected to the HDMI port to the point where i ended up unplugging it all together and went to one monitor. I updated drivers. No improvement.
In the past few weeks, my bluetooth keyboard and mouse (usb transmitter plugged into one of the USB 2.0 slots) will lock up nearly every day. The only fix is to unplug and re-plug the UD3900. The monitor will also drop out at least once a day, but will return after a few seconds.
At my witt’s end here. I loved this unit the first month i had it, but it seems to get worse as time marches on.
Any help would be appreciated