Very common apparently. I have the same on mine, I've tried various GPS antennas (OE and aftermarket) and cables but nothing solves the issue. I've come to the conclusion that it must be the GPS receiver module within the headunit.
You might be able to find someone who repairs these units that may help, otherwise it's a replacement headunit, that'll need coding to the car.
Cheaper solution is to install an MMI box for Apple CarPlay/Android Auto, that way you'll have sat-nav like Google Maps.
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