How to tell if NAZA is bad

[Dankguy123]

I have a problem with one of my phantoms that just happened today. when I start it up after I have 6 or 7 gps. it automatically starts going up even when I pull the throttle down it comes down but when I let go it goes back up and not straight either its unflyable. Does anyone have any idea what is causing this? I have a feeling its the NAZA. I have calibrated it and everything and im on the latest firmware. let me know what you think it might be. I was thinking the barometer or something but not sure Id like to know if anyone else has had this problem and fixed it thanks