Vauxhall Astra Sat Nav Not Working

This morning i get in the car and it says navigation initialising thinking it was just trying to lock onto satellites or something i carried on. I have read this is an issue for some but it is allegedly curable by manually selecting night mode and then resetting system to auto. I really like the car but the sat nav isnt working and wondered if any one has any advice for me.

vauxhall astra sat nav not working

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However had it 2 days and today the sat nav navi 600 decides it is going to play up.

Vauxhall astra sat nav not working.

I have recently had a new alternator and battery fitted and since then my built in sat nav will no longer work says initialising but gets no further any ideas have also tried ejecting disc but will not eject.
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The sat nav system where fitted is easy to use with clear voice guidance and.
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Has been fine for a couple of days this far.
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Astra j navigation system screen not working hewa rostami.