Speed limit of 145mph

Mrs H recently heard about problems with a new Alfa Romeo and its speed limit warning system. On a stretch of 30mph urban road it showed a limit of 145mph for example.

Not an unknown problem apparently -

My Tonale is now just over a year old and from new has coped very badly with recognising speed limits.

I have it showing 10mph in 40, 45mph in 20, 145mph in 40 - you get the idea.

This is every day not just every so often.