So, after A LOT of playing around, I have finally figured out that selecting the Graphics Level option "Automatic" or "Force OpenGL ES 3.0" has been producing this Unity error:
12-31 20:53:18.554: E/Unity(27186): [EGL] Unable to create context!
12-31 20:53:18.554: E/Unity(27186):
12-31 20:53:18.554: E/Unity(27186): (Filename: Line: 238)
12-31 20:53:18.554: E/Unity(27186): [EGL] Error:: EGL_BAD_ATTRIBUTE: An unrecognized attribute or attribute value was passed in the attribute list.
12-31...
Force OpenGL ES 3.0 causes startup crash on S3
12-31 20:53:18.554: E/Unity(27186): [EGL] Unable to create context!
12-31 20:53:18.554: E/Unity(27186):
12-31 20:53:18.554: E/Unity(27186): (Filename: Line: 238)
12-31 20:53:18.554: E/Unity(27186): [EGL] Error:: EGL_BAD_ATTRIBUTE: An unrecognized attribute or attribute value was passed in the attribute list.
12-31...
Force OpenGL ES 3.0 causes startup crash on S3