The issue is the mouse starts hopping around the screen when the RFD900x is plugged in.
This happens when the RFD900x is powered from an external BEC set to 5.5V or powered from the USB port. 3 different laptop models have shown the issue. Toughbook CF-53, Latitude E5540, and an Ideapad Y50-70. The Ideapad has been the least affected by the issue but it still happens on a semi-regular basis. Several RFD900x radios shown the same issue. Board version of the RFD900x does not seem to matter. Several USB to pin breakout FTDI cables were tried as well. Stock antennas and 3rd party antennas were tried as well. Firmware version is 3.07.
I am close to ground isolating the radio and FTDI cable in hopes that isolation fixes the issue.