Fairphone

I just opened a map and it's off by >45° again. Doing a calibration makes it a good bit better but still quite jerky and rotating the device 90° (i.e. using a wall for reference) still does not result in a 90° turn in the compass.

Does anyone else experience this? Please include the ROM and version used.

Edit: Should have mentioned this is a FP4. Other FPs are entirely different hardware.