Problem with the magnetic field

During the last deployment of the blue-Rov it was not possible to get the control. Qgroundcontrol showed there were problems with the magnetic field. I closed the program and started it again, and the problems were obsolete.

Does anyone have similar experiences?

I have had that of two different reasons:
1 Working close to metal, like wrecks, powercables.
Solution: be aware of that and do not use auto heading but manual control.

2 Calibration error on ROV at start.
Restart of ROV usually solve that, if not Recalibrate.

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