As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLT CAPT SIDE MCDU WENT BLANK FOR APPROX 15-20 SECONDS. SCREEN RETURNED TO THE MENU PAGE HOWEVER THE ACARS PROMPT WAS MISSING. ACARS REAPPEARED AFTER ANOTHER 10-15 SECONDS. OUR OUT, OFF AND FUEL ENTRIES ON THE FLT LOG PAGE DISAPPEARED & WE RECEIVED AN AUTO-INIT PROMPT & DATA REQ. GROUNDED - YES. PERFORMED FIM 34-61 #804 ALL OPS CHECKS NORMAL. OK FOR CONTINUOUS SERVICE.