My Cloud OS5 - Indexing taking forever

It’s also playing havoc with the Plex app - has no difficulty with the films - when it does finally realise that I want in and not out - but Plex is doing one of the following:

Doesn’t let me in at all;

When it does let me in, it won’t even start to shuffle my music - just starts turning for turning’s sake, then gives up;

When it does make an effort to play, it won’t do so without stuttering and thinking I have pressed pause!