I'm not sure I did this right but here is what happened. This was my second flight. The first flight was fairly short and all manual. Booted up as normal, checked the Alta App, everything normal, preflight check normal, Armed and started motors, turned on the safety, checked controls correct, set home position and returned the switch to the center position, spooled up and took off and climbed to about 30 feet. So far a normal checklist. So far so good. Switched to position mode and the aircraft started to climb slowly so I fine-tuned the throttle by adjusting the position slightly. Hover ok but the aircraft was drifting slowly east then it started to slowly climb again. Kept fiddling with the throttle to try and stop the climb. It is now at about 100' and about 500' away from me. I made a few turns and brought it back closer to me. I was still not very happy with the position mode because it would not stay put. It kept slowly drifting to the east. After about 3 or 4 minutes the Alta was about 300' away and at about 50' and drifting again. I tried the return to home switch and it took off to the east. It was moving fairly quickly so returned the switch to the center position, went back to manual control and brought it back home. It was kind of scary because for a few minutes I had no control of my aircraft. With just a little more flight time remaining I put it back in position mode, still drifting, then moved into position for landing. Everything went just fine until I got down close to the ground. I switched to Manual to land and got it down but it was drifting slowly toward me. One of the gear legs sunk into a soft spot just before I got it stopped and the Alta immediately flipped upside down damaging all 6 propellers before I could get the motors shut down. I should have set had the safety switch off before landing before landing. If I had been able to shut down quicker it may have only ruined 2 or 3 instead of all 6. So there were two problems with the flight. The expensive one was due to my inexperience and no pre-landing checklist. I have one printed up now and stuck to the transmitter. The other is probably a two-part problem but I think they are related. Has anyone else had the Alta just take off and fly away when the return to home switch is thrown? Is it normal to set the home point before takeoff or do you just let the GPS find the current position? I did not expect to have constant height control issues in the Position mode. I thought that altitude should be pretty stable. I never did try the Height mode only. Maybe that would have stopped my constant fiddling with the throttle to maintain altitude at 50% throttle. Any feedback would be appreciated. I would really like to find another Alta pilot in the area to spend an hour with going over procedures and expectations. My preflight training has been flying my Phantom 4 pro in the A mode - no GPS and I feel pretty confident flying the Alta in manual mode even though my second landing was a disaster. If the landing area was not so soft I probably would not have had any problems. I should have used a landing matte. I have one but forgot it. https://www.harborfreight.com/4-piece-anti-fatigue-foam-mat-set-94635.html Thanks for your feedback.