Naim iPhone App No Longer Plays Whole CD Nor Display Song Playing

I would reboot everything, including doing a hard reset of the iPhone (press and hold both the home button and lock button).
If this fails to sort it, delete the app from your iPhone and reinstall it.

What I really meant was to re-boot your NAS, Unitiserve, computer or wherever you music is stored, as well as your network (router)

Oh joy!  All of my music is stored on a Netgear NAS.  I was originally going to reboot at least the NDX and the iPhone/iPad and see what that did, because nothing made sense otherwise.  First, the app behaves the same on both my iPhone and iPad, so that would seem to indicate that it's not the app.  Second, I can't see how it would be the router or the NAS, since the music plays fine, just one song at a time.  I think that eliminates everything but a handshake between the NDX and the iPhone, since the NDX displays the music correctly (and therefore has a correct connection to the NAS).  It's just not playing the whole album when the whole album is selected to play. But no harm in trying!  After I finish watching the Revenant, I'll delve in!  Thanks for the advice!

@Blythe, thanks for the quick help.  I started by rebooting the phone, an while I was rebooting the phone, rebooted my NDX.  I did not reboot the NAS or router, planning to do that next.  However, shutting down the NDX and turning it back on did the trick and everything is back to the way it was before!  So easy and quick fix!