Live viewing is not always working on my smart phone either in GPS or manual operating. It's either freeze or serious time lag. What's wrong with my setting ? When the live viewing was not working, I have problem to identify the distance between PV2+ and obstacles nearby. For example, when it was flying toward a tall tree, I was not able to tell if it was 20 ft or 50 ft before it crashed on it, when I was standing 400 ft away from the flying device. It could be a parallax issue, how can I overcome this problem ?