Compass problems due GPS?

hey guys,

I have a very weird problem with keeping my copter in one direction, but only if i add the external compass. I have to disconnect the I2C cable to avoid that. I calibrated both compasses several times but it seems to work only with my internal compass. It also seems to start toilet bowling and going back and vice versa if i connect the external one. how can it be that the external is causing problems but not the internal compass?

any suggestions?

thanks

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