I have a problem with my phantom. Every time I turn it on it displays rapid yellow lights like in fail safe mode.( It says fail safe when I connect it to naza. ) With no connection to my remote. After at least 10 minutes I finally get some green lights. After lifting off after about 30 seconds I lose connection again and the phantom automatically goes into fail safe mode. I am about 10-20 feet away from the copter. I have replaced the ceramic antenna on the GPS, I have calibrated IMU, and everything is up to date. Any help would be appreciated thank you.