What was found
AFTER 4TH DISCONNECT AUTOPILOT A SELECTED APPROXIMATELY 3.5 HRS INTO FLIGHT AT FL 360 AUTO PILOT B DISCONNECTED NO INDICATION OF CAUSE FOR FIRST DISCONNECT LATER IN FLIGHT AUTO PILOT B DISCONNECTED 2 MORE TIMES AT 3RD DISCONNECT A VERY BRIEF SPEED LIMIT OR SPEED FLAG ANNUNCIATED ON THE F/O PFD WITH THE VMAX, RED & BLACK ALTERNATING BARS, MOMENTARILY DISAPPEARING & THE LOW SPEED BUFFET, VMVR, AMBER BAR MOMENTARILY DISAPPEARING. ACFT GROUNDED. AUTO PILOT B DISCONNECT ARE RESULTS OF SPEED LIMIT FLAG. ACP FIM. 27-32- TASK 833 SMYD NR 2 SHOWS NO EXISTING FAULTS AND NO FAULTS IN FAULT HIST. SELF TEST PASS, FAULT ARE INTERMITTENT.