I've had severe issues with the LG G7 ThinQ flying with the
Mavic 2 Pro (all updated with latest firmware at the time of this writing). Sometimes I can fly with no issues, but randomly there are very bad connection issues, and the app just loses connection to the Drone. I've tried fiddling with the cord, restarting the drone/controller/phone multiple times, making sure it's fully plugged in, etc. If the GPS home point was not stored, I would be totally screwed. As it happens, once you lose connection, the drone thankfully returns to the home point and lands automatically.
I've tried flying with 2 different USB cords with the controller to phone, and was having issues with both. I then REPLACED the phone through Verizon, and still the brand new phone is having issues. At this point I have no idea if the drone and/or controller is a lemon, or if there are systemic issues between the drone and the LG G7. Next step is to buy an Ipod Touch and see if it's OK -- I have heard that Apple products work much better with DJI drones.