Just a quick look through and I don't really see anything obvious. It appears you had a long flight with a few minor warnings, then once back near you, you switched to sport's mode, did a few erratic manuevers until you were over the trees across the street, as you said. The only possibility that I can see from that, is possibly, and say this only because it has happened many times, that the battery was not fully secured and loosened after flying around in sports mode. The data stream ended at 128ft @12mph right over the trees (approximately).