Sutra:
262. kalangi upAyabuddhyA paNNum prapaththiyum pAthagaththOdokkum.

Sri PBA Swami's Sarartha Deepikai:
It is said now that repetition of surrender is also included in the pApa word.

The act of surrender can be done only once. It's nature does not tolerate repetition. Without realizing that, repeating the act of surrender for gaining something or removing an obstacle is equivalent to a sinful act.