The MIB 1 is something never loved, have always put it in the average to ok category, quite slow in transitions, and the DAB is part of that, and it might not be down to the MIB itself, it maybe antenna or just a weak signal but the all or nothing nature of digital drives you nuts as it cuts out completely with that crossed ariel sign - just adds to the overall indifference to the media system functionality.
Hoping the MIB 11 with the bigger screen will be greatly improved though do not expect the DAB to be, the technology is great when works but too unreliable to really ever enjoy.