iRadio preset for Classic FM on SuperUniti

If I save Classic FM as a preset on my SU, and either choose it, or leave it as the previous choice, the SU seems to hang when switched on with a Please Wait message on the display, the IOS App failing to respond, however, if I choose Naim Radio or Radio Paradise the stations just work, so it seems to be a Classic FM, and maybe others, problem.

Any thoughts?

Thanks, KR, J