Glad you have sorted the volume control.
I’m not sure how paid radio stations work with Naim’s new iRadio service. They had no choice but to move on from vTuner, and their new in-house service is very good on the whole.
Remember to delete any presets you had saved from vTuner as you’ll need to save to save these afresh to get them to work now. Also check that your streamer firmware is up to date to get the new iRadio service.
If you have any issues with specific stations you can use this thread to ask for help:
The ND5XS2 has indeed been discontinued recently, but it still uses the latest streaming board that the current product have, so it should be supported for a long time. Now might be a good time to hunt out a bargain as retailers seek to clear out any remaining stock.