"Weak signal. Make sure the remote controller is facing aircraft and avoid blocking the signal (Code: 80016)"

This is letting you know that the signal between the drone and remote controller is weak.

Typically, the strongest signal can be achieved when the antennas aligned perpendicular to the drone. For example, if the drone is far away and the roughly same height as the remote, have the antennas point either directly up to the sky or directly down to the ground.

We also advise that you observe your surroundings for possible interference.

Last, be sure to check within your flight app for what actions your drone will take if the signal is lost.