When your plane is out of sight (often abbreviated as LOS), you can only see what's around your plane with the photo view in the DJI Go app. In such situations, you are more likely to accident..that's why my first fycam is broken. The advice for you to play is to fly in your field of view

Hi, we're sorry to know about this situation. If your aircraft experience an incident, I would recommend syncing your flight records using the DJI GO 4 app and contact our support using the link below for further help. We highly recommend flying the drone in open areas wherein there are no interferences and maintain the VLOS to monitor the aircraft during mid-air. For additional information, if the product is no longer covered by the warranty period, data analysis can't be applied. Thank you for understanding.

www.dji.com/support

Yes.. always good to have it in sight..  

often this is not enough. You look at the display for a moment while Spark is moving and you have already gone to something.
That's why they usually ask for help. A man looks at the drone only and says if he is approaching an obstacle.