In State v. White, 150 Vt. 132, 549 A.2d 1069 (1988), the Court explained that a probationer is automatically discharged from probation upon the expiration of a prescribed period of probation. White, 150 Vt. at 133-34, 549 A.2d at 1070-71. Consequently, the trial court lacks jurisdiction to revoke or modify probation based on a complaint filed after the expiration of a fixed probation term. Id. at 134, 549 A.2d at 1071.