I've been using a new dock (tested working according to Warpia) and it has done the exact same thing. I did find however that only connecting one extra monitor (so laptop screen + one 24" monitor via DVI) will make it work without fail. The minute I plug in my second monitor (DVI to HDMI adapter) it will do the sporadic disconnect.

Hi all, here's another suggestion: I had two displays, one connected DVI to DVI port on my USB dock + monitor 2 using DVI from the monitor -> dvi to hdmi adapter -> hdmi port on the dock. So I changed the DVI cable with hdmi adapter to an HDMI cable (no adapters) and i've worked for three hours with no disconnects.