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WRT the seat belt warning..... there's a pressure pad in the passenger seat. The weight of what you have put on it is probably just on the cusp of triggering it. So, sometimes it sets it off, sometimes it doesn't....
I had a faulty pressure pad in the seat, and of note, the airbag won't deploy on the passenger side if it doesn't think anyone is sitting in it. Easy way to test. Get a person to sit in the seat and drive. Somewhere very safe, and slow, get them to remove the belt. The warning (dashboard not audio) should stay on, not be intermittent. My fault had the warning intermittent, so sometimes the car thought someone was in the seat, sometimes not. But, I suspect yours is just down to the light weight you have on the seat.
As for Nav restarting and LC, I can't help with that. But hopefully I've helped with the first.
Enjoy the car!
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