Really?
i can’t say I’ve had a problem have you had any nav/ head unit updates yet? mines had to upgrades to the latest firmware I think it’s called, I’m a wood worker not into IT but I’m sure that’s what they said it was.
I use it most days and can’t say I’ve noticed it wrong or slow, it changes as soon as the speed sign changes or most of the time just before.
have you been caught out with it then?