Can not fly after pixhawk restart

Hi, I have encountered a problem a couple of times now which is the drone not being able to fly after restarting pixhawk in order to change the battery. I am able to arm the drone but moving the throttle lever makes no difference. QGC doesn’t tell me anything but the vehicle is armed and in manual mode.
I have solved it by reinstalling the firmware and uploading the parameters the both times.
If anyone knew what can be causing this problem it would be greatly appreciated. I am uploading a flightplot so you can see some warnings that appear which say:

[mc_pos_control] Stabilized-Ctrl failed with error: Activation Failed
and
[mc_pos_control] No Flighttask is running

PLOTS

Thank you!

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