Hey Joe, this morning I was listening to a Spotify playlist and noticed that the R5 indicator was orange, then I noticed that the frequency reported in the shade was saying 352.8K!
This continued for the last few tracks in the playlist, then when I returned to these tracks later (neither the R5 nor Spotify had been shut down in the meantime) the light was it's usual blue, and reporting the usual 44.1K.
I took advantage of the 99p for 4 months of Amazon offer yesterday and now have the Amazon Music app installed, I wonder if it's possible that's interfered with the Spotify reporting somehow? (I confess to complete ignorance of the inner workings of Android et-al BTW, but that's probably obvious from my question).