I've been having the automatic shutdown issue with my Galaxy II Exhibit ever since I got the app.
It'll play fine for about 1-2 hours, then make some skipping noises, then shut down all by itself without any real warning.
I'm using the free version with ads, but with this sort of thing happening frequently, I'm worried that upgrading to the ad-free version won't make a lick of difference for the money.
I like the programming, I like the playlists, just getting put-off by the fact that this app seems to have a mind of its own some times.
In addition, I also have the Sirius app and it runs practically trouble-free on the same phone.