help please my runner keeps trying to flip

Hello guys, I'm having trouble with my runner 250 advance, I'm not too sure on how the flip options work on this thing, but when I'm in f-mod 0 or 1, what I move my forward lean stick too far past a point while I'm flying it wants to do a barrel roll. As I'm flying, when I'm wanting to go faster so I lean more forward and it keeps.just wanting to flip ok me! It's crazy. So I've completely destroyed it. Still eating on parts... 150$ fix, have had it for only 2 days... don't even know if I should keep wasting money on this thing anymore if it just Flys like this. Please if anyone has a solution for this or can relate, will be much helpful! Thank you

 

Sounds like it could be calibration issues. You should also update your firmware. It's difficult to diagnose without more information. When you get it back together go slow and get some video, it would help others help you. I went from a toy quadcopter to this, it took some time to get used to the power.