Update:
I connected a new gps fakra antenna to the back of the ccc and it showed all the gps info on the nav service menu. It worked! Thanks to voucher for the assist. I got all the right messages on the service screen, therefore it means the bmw gps antenna in the shark fin is not working. All I need to do now is order the right antenna and replace it under the shark fin.
Lovnblack, I am not having an issue with the signal not lasting like you and I am not using an aftermarket antenna as a permanent solution, just replacing the gps antenna under the shark fin. Hopefully someone can help you more than I can. Good luck.
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