I was flying my phantom and while it was flying I was getting yellow and red alternating lights . The phantom was drifting and would not hold its position . Eventually it began to rise and drift off into a little speck in the sky . I have located my phantom it's in a tall tree . What went wrong ? Edit : Before take off I I had it in GPS mode and spun it around on the ground vertically and horizontally . I even circled a magnet around the compass on the leg too .