38.03 Waiver of grounds of disqualification by parties.—The parties to any cause, or their attorneys of record, may, by written stipulation filed in the cause, waive any of the grounds of disqualification named in s. 38.02 and such waiver shall be valid and binding as to orders previously entered as well as to future acts of the judge therein; provided, however, that nothing herein shall prevent a judge from disqualifying himself or herself of his or her own motion under s. 38.05.