I was testing some new props and wanted to climb to 100ft alt.  I got to about 30ft and then the Mavic Air lost connection.  It reconnected and I brought it back down.  Adjusted the Tx antennas and tried again.  Same problem.
I was recording the flight with a head mounded GoPro linked to a phone via wifi.
Turned off the GoPro wifi and the interference was gone and did the 100ft climb.

Just something to be aware of when out in the field.  

Hi Hummingbird.UAV, thanks for reaching out and sorry for the trouble. I'm glad that nothing happened serious and you were able to control the situation. Since DJI Mavic Air is using enhanced Wi-Fi connection, there's a possibility  that it was interrupted by the Wi-Fi connection of your GoPro and your phone. I hope everything is fine now. Should you need any help, please feel free to reach us. We're here to help and thanks for your continued support.

My Spark started giving me audio warnings while it was hovering and filming my RC model airplane.  A gopro remotely controlled by the phone was filming the plane too.  Seemed too many radio control items in a tight space started interferring.  GoPro not using the cleanest on channel radio?

Bad combination, I almost lost a drone to a building by recording with a gopro using wifi.

bad combination indeed.

Lucas775 Posted at 3-20 17:04
Bad combination, I almost lost a drone to a building by recording with a gopro using wifi.

Don't ever remember having this problem with my Phantom 4 or Mavic Pro.

I would avoid that.....Wifi connection is very sensitive to interference and two wifi device at the same time one near the other is not a good idea

Hummingbird.UAV Posted at 3-20 17:53
Don't ever remember having this problem with my Phantom 4 or Mavic Pro.

mavic air uses enhanced wifi so susceptible to interference from other wifi devices, occu-sync devices are more robust

Alex1976 Posted at 3-21 03:36
I would avoid that.....Wifi connection is very sensitive to interference and two wifi device at the same time one near the other is not a good idea

Wonder what would happen if two Mavic Air pilots stand close together?

Would be very interesting to see.....