The app. was showing " weak r/c signal" so I thought I would try reconnecting to the r/c to see if the signal improved - big mistake! Having started the process from the r/c, I realised I hadn't checked where the reset button was on the drone and, whilst looking for it (turning the drone round and round) the flashing lights turned from green to flashing yellow. Since then, I have tried reconnecting many times - properly this time! - with no luck. Can anyone out there in drone land suggest a solution?