Thanks @jonas ! My skills at C++ are not that great so debugging will probably become hard. The strange thing is radio paradise does not suffer from this.
With having hard-coded radio streams inside strawberry being a bad idea is something I fully agree on. However, looking how "Radio" is currently implemented, I just followed this way of implementing. I took Radio Paradise as an example/template.
It would be much better if strawberry would give the user a possibility to import (via a .m3u or .pls file???) radio station streams where strawberry would store them in its database and show them under "Radio".
I'll see if I can fix it, but don't count on it. If it fails, I'll (ab)use playlist to get my favorite radio stations into strawberry.
Thanks for your time and effort on this!