Volumio UI disconnected from backend

A strange issue has happen to my Volumio - when I control Volumio with MPD (load a playlist and play) it works great but the UI doesn’t seem to update the metadata. The UI does show the progress through the song playing but the name and album art are stuck at the previous played track from my library. This used to be fine up to a few days ago and I haven’t updated so not sure what has gone wrong? Anyone any ideas about how to fix it - I don’t really want to reset everything as I have about 100,000 songs already imported into my library from my NAS.