While flying a mission a low battery warning came on (30%), at which time I hit the RTH button. Instead of returning home, it started heading in a completely different direction. I had to chase the UAV down and land it manually. I have checked both DJI Go App and DP App, and can't find where something went wrong. New to this, so I am sure that it is something I did, or did not do correctly. Help is greatly appreciated.
Samsung Galaxy Tab 8 (SM-T377A)
Android V - 6.0.1