My 7.5 seems worse that my old MK7's or indeed my wife's 2016 Polo Blue GT !
On mine, I seem to loose the DAB stations a lot more frequently than it does in her car when driving down the same roads?
Also, don't know if it's related, but when on the INFO screen when listening to the DAB channels, almost every preset I have (except Radio 2), is missing the larger station icons on that screen, but in the wife's for exactly the same stations (almost), her system downloads and displays the full size station icons immediately (even if they are sometimes different to the ones applied for the radio pre-sets logos).