Don’t recognise many of your problems except poor fitting but one thing missing on your list which my Xtrons (Jubbs) suffers from is GPS lag, it takes ages to find satellites unlike my old Win unit. Repositioned aerial, tried another GPS programme, still the same but weirdly, once it finds them it’s fine for hours, can go into shops, restart the car and instantly there but next day after a long sleep it’s the same procedure again.
Regards
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