Quanum Nova FPV GPS Waypoint QuadCopter (PNF) problem

I just received a Quanum Nova FPV GPS Waypoint QuadCopter (PNF) and have done all the calibrations numerous times, checked the parameters against different forums inputs, checked all connections and still can't find what is wrong. It will arm, lock on GPS ok and can give it throttle and it rises ok. If I try to give it any directional input it will immediately dive to the ground in that direction. I think it would probably turn upside down if it was high enough. I am using a spectrum DXS7s with an orange receiver and have tried it with no extra settings along with it set up for less sensitive sticks. It does this in stable mode or ARCO mode. I have checked it with mission planner and held it by hand with motors running and it seems to track on the screen fine. In stable mode it seems the motors are changing speeds to compensate when I tilt it. I am going to try it with my Turnigy 9x transmitter but haven't had a chance yet. I am thinking it may be a bad FC but wanted to see if you could give me any more things to try before I send it back. Thanks Dan Rhodes