The Conductor app is regarded as one of the best apps available.
It has many levels and can be used in Folder mode which is bare bones just lists your songs, which I prefer, or full blown pics of everything which I find too busy.
The only issue I've encountered is if you phone/tablet uses multiple ISPs you have to switch back to the network that the Aurender in on for it to work.
The Conductor app is available for iPhone and Android maybe switching would help.
If you're happy with the sound you're getting this is an easy fix.