Every time I use my Tello drone that I bought a few days ago it randomly “disconnects” sometimes. It says I’m still connected but the camera view that is shown on your mobile screen just turns dark/grey and I have no idea why. When it happens I can’t control it. It just flies straight in one direction and it won’t land. The only way for me to stop it is to grab its leg and press the power button. The battery is fully charged and I’m just 1 meter away from it so I’m very confused.