Firmware arducopter 3.0 vs 2.9

As I am quite new in this hobby, I could be wrong but I guess my quad was very stable loitering few weeks ago. Right now, I have a huge problem with the drone going mad and climbing 72 m instead staying quite at 2 m... and the loiter is not stable anymore .... Could it be wise to go back to arducopter 2.9 ? Any advise ?

Cheers

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