Answered Robo 3D R1+ hates the Z axis

Just bought a Robo 3D(This machine looks straight out of the future!) it starts with the extruder in contact with the bed, legit printing. After a while however, the extruder inevitably starts trying to print in the air, acting as if the print bed is floating. I've tried preheating the extruder and bed, homing the axis, but neither fixed the problem.