The navigation system failed for me today - it stayed showing the position at my home, after I started to drive away. (My old TomTom had an on-screen GPS signal strength indicator, but I don't see anything like that on the ID3's nav screen)
It has been working OK over the last 2 weeks
(Edit: after resetting the infotainment system, it now thinks I'm at “null island” off the west coast of Africa)
Nav system failed
It sorted itself out the following morning