Compass problems px4

Hi guys,

I am having 2 problems with compass issues using PX4.

First 30% of the time im getting compass inconsistant problems. We have tried again and again to disable the internal compass MAG1 in our CUAV v5plus but it never actually seems to disable. Has anyone managed to completely disable an internal compass?

Second 2 and 3 axis calibration never seems to work. It finishes sucessfully but brings the compass inconsistant error up to 80% of the time.

We have always had these problems using CUAVs flight controllers on many different drones. Are these known issues?