The following is far from what i understand. Done the latest updates. All was fine and then i've seen in some threat that it was also advisable to do a advanced IMU calibration. So i did. That went good but i noticed that i had issues with the satellites. I know that day or nighttime makes a difference so i waited till dusk. Fired up and 8 sats. On its way out i had no issue's but decided to initiate RTH. It came back and toke over control, some 300m away the sats were dropping below 6 because i could notice it was going into ATTI. I tried to compensate but it all went erratic. I got a " hight limit warning ". It was only 50m up and the limit is set to 500m. It went full force forward and descending ( in the wrong direction ) and there was nothing i could do. I gave full throttle up because it was on a course with destiny crash. It didn't respond, after 5 sec it stopped and turned 90degrees and it went back in the previous mode ( full force forwards and descending ). Again i only gave full throttle up but it just ended on a neighbors shack but was caught by a huge shrubbery that had his branches hanging over that shack. The extended landing gear i made broke of and it protected the bird because it toke the initial impact ( what a bang ! ). My suspicion is that the software had a hiccup and went tilt. Status of the bird. One broken prop. Ripped of home made landing gear. Lucky my neighbor who came home from work and was interested in the bird also got more he bargained for. He witnessed the expensive joke going out of control. Maybe someone else toke over control but it doesn't explain that sudden hight limit reached warning that i caught with my eyes. I only want something thats reliable, not something that can kill a person because that can be if someone get that expensive joke against there head. I know coincidence doesn't exist, i'm not going to be happy if i have to pay that price. Ow and don't be sorry pls, **** happens. I repeat " Ow and don't be sorry pls, **** happens "