My tello drone flew high up in the sky and became invisible.. very strange thing happened..I took off dji tello..it was behaving little strange..it was very fast however I didn't use fast mode..when I took off it goes high up the sky directly and then It came little down..when I tried to keep it down suddenly it goes up in the sky very fast and became invisible..I kept waiting for it to come down but I lost it..there might be some problem with sensors..just want to add that sun was shining brightly and there was no wind..what could be the problem...can anyone guide what could be the problem?