I need to optimize a molecule using gaussian which should strictly follow Td point group from start to finish but it seems that halfway during optimization the molecule loses Td point group and transforms to C1, which I don't want.

I've already tried symmetry=(on,follow) keyword in the input file. The molecular structure was symmetrized and constrained to Td subgroup (point group symmetry was also enabled) using the point group option within gaussview. Still no luck,final structure is C1. Any help will be appreciated.

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