Was out flying this morning and my H had 19 sats and when i pressed the red button to start the props I noticed that it didnt spin up. Pressed the red button again for 5 seconds and actually started to spin. I was on angle mode and all switches were in there correct posn. Never had it take that long to turn on. After it spun up I took off and leveled out then it started acting erratic floating around and not stable. I tried to correct but it got worse. It ended up flying backwards by itself into some bushes and one of the props broke. Its been so stable with at least 7 previous flights and then today totally unstable. This was in the back yard of my parents home in a different location then previous so I am assuming it was interferrence? I did do two flights in their front yard with no issues, even flying up to 200'. They do have lots of trees and wifi prevelent so i am assuming thats what is causing it. Its kind of disappointing to know that if someone wants to film/fly around there house that the bird can go erractic and possibly crash. Is there anything that can correct this?