It werks now, but I have stopped trusting it
When you switch it on...in your house ....I think it goes back to where you last where when you switched it off, even though you've cleared the memory as requested.
I could be wrong, but suspect I'm right.
As I said. Modern technological shite.
If you switch it on in your kitchen it can't 'see' the satellites to get new positioning information... therefore, as far as it knows it is still in the last place where it could see the satellites... see...?