Comment There is a hardware issue (Score 1) 202
There is electrical interference between the board and the USB interface that results in the Ethernet connection dropping packets. The solution is to cut the +5V (red) wire or insulate the matching pin on a device connecting via USB to the board. In all other ways, things are fine if you're powering 5V at 850mA to 1A. So, just a small bug to fix on the next iteration of the board design.