(a) At any time, not less than six (6) months after the appointment of a guardian or conservator, the ward may petition the court alleging that he is no longer a proper subject of the guardianship or conservatorship and asking that the guardianship or conservatorship be terminated.
(b) If any petition for termination of guardianship or conservatorship is denied, no other petition for termination may be filed until six (6) months have elapsed since the denial of the former petition.