DAB reset

Hi, all of a sudden my 2015 F12 DAB isn’t receiving signal. Any suggestions?

Is this across ALL stations? National and local?

Any issues with the shark fin aerial or water ingress into the boot etc?

Unless BMW are different, DAB ariels are a seperate item to the FM ariel in most vehicles because of the very nature of how they recieve a signal, therefore it is unlikely that it is located in the shark fin.