For a year now I just began to use the Onkyo music player unlocked instead of the packaged one.. Because it sucks. It froze too much for me. You only can deal with that so many times before you either get another music player or ditch the 100r altogether (luckily the Onkyo one is high res and compatible with my Pioneer since they're in the same product family).
It was a fault with the hardware not a problem with the app, in the end.