I have the same problem on one of my devices (Xioami Redmi 1S, Android version.in 4.4.4 KTU84P, MIUI version Global 8 stable 8.0.1.). Poweramp version 703, but it was the same with the 588 version. I have to use a Wi-Fi connection to get it running again. The other smartphone (HTC Desire, Gingerbread 2.3) works fine with 588. Is it a phone bug or some compatibility issue? And it didn't cancel the settings after reboot but again started the routine with verifying the purchase (it was purchased via GooglePlay)
