Copter height fluctuating so much rapidly over time without any throttle input

hi guys i was flying quad in altitude mode(no gps used) and at the start it was stable but over the time height was very fluctuating and suddenly it started to increase and decrease height rapidly so please help what is the problem with my quad and battery used was 3s lipo were around 11.20 v when i landed the quad and please help me and here is the bin file link

You can’t expect much on default parameters w/o even the pre-flight Initial Tune Parameters done.

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Ok and going back from arducopter 4.3.5 to 4.0.7 solved the problem I think 4.3.5 has a problem with ms5607 barometer

Ah OK, you have a junk Flight Controller.

Pixhawk 2.4.8 is not a junk flight controller only barometer is little bit less precise and rest of the sensors are good

There have been a few versions of that Flight Controller each one of lesser quality than the previous. You have the latest version.

Ohh ok and thanks for helping me and have a nice day :+1: