Hey! Have you tried uninstalling and reinstalling the app/desktop client? I know it;s a bit of a standard answer but I've found that tends to fix the majority of my problems with search.
Daily Mix - if i like mine I save it to a playlist so I can revisit it - might be worth doing in the future! Also, the more you listen the more the system learns what you like and the AI can serve you with a better mix of track.