Basically it would stay stuck at the yellow sprint splash screen.
I figured something might have been corrupted with the OS or the like, so I've tried a few different roms.
All of them, upon booting start throwing up a com.android.phone process died error message.
I have the teamwin recovery ROM installed.
At this point, I'm about to give up and throw the damn thing into my blender. The phone may as well be bricked at this point, because with the com.android.phone process crashes, it is pretty much unusable.
I can't find any other ROM's to try, and the "factory" ROM links go to some shady semi-paywalled sites, or never ending ad-loops.
Any pointers on a good quality ROM w/ root that work well on a Sprint Galaxy S4 would be appreciated.