Altitude error in auto mode

@ahmed wrote:

Hi all ,

Arduplane 3.4
GPS ublox 7m

I set waypoint to altitude 500 m , when I change mode to auto plane flow the path correctly after 2 waypoint starting gain alt more than 500m the wind was good throttle is also good about 50% , but plane keep gain alt until it reach 900 m ,

Change to RTL it come back home and loiter , but still gain alt until battery get low and decent .
GPS was good and try again with change GPS , same problem ,

Test it in stab mode it's very stab ,
Servo limits value is good by using another pixhawk ,

What's the problem ?
What should i capture from the log file ?

Regards .

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