The chances of stalling an Arrow to that extent are almost non existant. As soon as the nose drops and it gains any airpseed whatsoever its going to be flying again. Flying inverted isnt any more stressful than flying upright on the electronics.

Just guessing here but respectfully, my money would be on...
1. Panic set in, you got confused and you and overcontrolled it into the ground. 75%
2. Your receiver battery voltage was low. 10%
3. You had some sort of mechanical failure 10%
3. You had some frequency interference. 5%

Some questions.
Exactly what was the last control input you gave just before it went nuts?
Was it twitchy. Jerky little pulses??
Where was the throttle on the way in? What was the throttle doing, where was it set?
HOW did it go in? Were you trying to save it? Could you see that your inputs were effecting the plane in any way, good or bad??