Today I took a short ride with the car and immediately tested the radio function.
Unfortunately, the radio still cuts out and does not come back when the choice of voice instructions is enabled. When the latter is turned off, the radio continues to operate normally.
Furthermore, the search functions look good and promises something for the future. It's just a pity that this (still?) can only be used when the route has ended.
Tested with the KIA Niro, Iphone 12Pro with iOS version 16.6 and MRA version 4.0.3 - 208