hmmm maybe that's why i'm not having as many issues since i've flashed v8 and kernel over previous versions of the same rom...
The issue with the screen shutting down and having to pull battery to bring it back happened to me once, i've noticed that the play store tryed to connect and update some apps during crash even though i didn't set anything to auto update.
During crash i was listening to music, the store tryed again other times when the phone was idle though, but it didn't crash on me again.
edit: just to confirm, Play Store seems to have many bugs, fcs, sometimes it starts to update an app but it does not completes it.