How far was the drone and where you in a busy area (residential/commercial)?
Strong interference which means just that... you should get the drone closer to ensure the connection isnt lost. For starter, make sure the controller antenna face the drone with clear line of sight. Not even your body in the way.
5 GHZ may get you a better signal but only short range. Whenver i ve tried using it, range was limited to 500' or so. It is useful for short range flight in busy areas but not for longer distance
