Well for starters try exporting the .mdl0 and putting it over a fresh Sheik model. If that doesn't work you may have to do some Psa work.
Edit: Also (obviously haha) you'll have to export/import your textures as well and any changed bones (if you changed any). If you did change the bones of the model, that could also be causing the freezing issues as it can mess with the animations and what-not of the moves.
ive done that and the only ones renamed are ponytail bones