[PROBLEM] MPD caching old IP for NAS

[Snags]

P.S. (Sorry to double-post) I agree about the rather perfunctory nature of the Synology docs around some of the packages. They're very much at the "Do this and it works" level, and the rest is black box. Which is mostly fine, because mostly it does work, but it isn't helpful for proper diagnosis and exclusion testing etc.