Reset BLU Life XL; now phone crash/reboots when incoming call ringtone tries to play

A few notes:
This error occurred as soon as the phone was reset. Further resets have not fixed it. Restored from image; didn't fix it. Having trouble finding images from the mfgr.
Running Android 5.1, Kernel 3.10..72
Phone has been rooted since.
My Android development is limited to entry-level at best, but I did run an example app that reads the ringtone; it reads "null."
Using a 3rd-party app ("Zedge?") to set ringtone "succeeded"/silently failed i.e. no change.
Attempting to open ringtone settings crash/reboots phone.
Remoting in via FileZilla/SSHDroid, I can still see the ringtones in the /system/media/audio folder. Downloaded to my PC, they all seem to play fine though one file in notifications seems glitched.
Phone receives calls fine while on vibrate. You can imagine this is not an ideal solution.
How should I go about diagnosing and fixing this?

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