Yesterday, when I was shooting (a crucial video shoot) with phantom, suddenly It was out of my control. The yellow light was blinking (while it was on GPS mode), I hope that means, it has lost the signal from the transmitter. Copter was about 30-40 meters away from me. I couldn't do any thing, but fortunately, because of the fail safe mode it came back and auto landed in home position. This happened in every time I was flying yesterday ( I flew it 7-8 times yesterday at the shoot). when it lost the control, sometimes I got the control back, when I switched the from the GPS to Altitude mode and switch it back to GPS again. Sometimes nothing happened. Only thing that I can suspect is, I recently installed a HiFly gimbal and plugged its pitch control to Naza F2 port. And turned on the gimbal control on assistant software. But when I gets this problem continuously, I removed the gimbal and turned off the gimbal control from assistant software. As I feel (may be my feeling wrong) it reduced the losing control problem a bit. But it happened twice again. I opened phantom, to plug the gimbal pitch control to NAZA F2 port, do you guys thing that I have mistakenly done some damage to a signal receiver or or something like that ? Please could you guys help me to fix this?