OK - so I've flown a few drones. But the P4 is my first "expensive" unit. I've had about 20 flights, up to 1.5 miles away. Never a single issue ever. Smooth as glass. Completely in control. 2 weeks ago, late in the evening, after a few adult beverages, I decide to try to fly indoors. In my relatively small living room. Big mistake. Takeoff is smooth. Drifting begins. Switch to ATTI mode, attempt to control and land. Run into wall, P4 flips over onto top, quickly pick up and switch off. I immediately start seeing compass errors on #2 - "disconnected". The trim near the 2 optical sensors is knocked off. I can fly on 1 compass (and do a couple of flights), but decide to send for repair (DJI authorized dealer in my region). Unfortunately, I broke the connector on one of the main boards where the compass connects. Probably $240 in repairs. My bad - I'm not going to piss and moan and look for a free repair. Just wanted to warn others. Be smart. Be safe. Don't be like me.