Quest Q60 with the Beast coil. 

1.Make sure the cord is properly connected, as this is often the cause of a malfunction. 2. check if the cord does not come loose from the stick. But not very tight either. (The video clearly shows that your cord is too loose around the stick) 3. Ground balance: pump 20/25 times, Gain on 85/80, Stay away from WiFi, electricity masts, turn off your phone. I managed to silence the metal detector quest. But it was also a real quest for me. 😅