As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSING THE INTIAL APPROACH FIX ON GPS. EXPERIENCED A COMPLETE LOSS OF PFD, ND, CAD AND VEMD. ALL SCREENS WENT BLANK FOR ABOUT 30 SECONDS THEN FLICKERED A DOZEN TIMES THEN CAME BACK ON TO STAY ON. RETURNED TO HOME BASE VFR WITH NO MORE OCCURENCES.