Uhm, so in the middle of a 4x4 solve, the internal piece of the ss4v3 misalign with the core. (The 'legs' on the core that lock the internal piece in place) Resulting that the cube can only turn on 1 single axis. E.g, only L or R moves can be done while others like U,D,F,B can't be execute at all. I tried fixing it in without taking apart and find it near impossible because it is the internal piece that misalign and my fingers are too big to reach them. I ended up reassemble the cube.
So, my question is, if this happen in a comp, is it a DNF? Providing that you can't fix it and the only way is to disassemble a small part of the cube.