Today I had my first flight away, gave me terror and panic, the PV was approaching a cell tower 100mts, luckily I remembered and turn off the remote control and happily turned toward me, uff ....
Unlikely to be a "proper" flyaway as RTH has no effect in those, they just keep going... Sounds like control interference from the tower causing it to do odd things. Stay away from those, and high voltage cables, too. Glad it came back nicely for you.