You got one of the major problems pegged with your response to the other 'forest flier' thread. GPS... or more to the point: the lack of it.
When you don't get a strong satellite uplink, the drone automatically switches to VPS (Vision...
Before you bought it, I take it you watched all the DJI bumf about the amazing obstacle avoidance. Sadly, it doesn't work that well outside the advertising videos. But the best way to learn what your drone can do: is to learn object lessons about...