MY 81 YR OLD FATHER WITH ALZHEIMER HAD A PEG ( FEEDING TUBE) FOR 4 MONTHS NOW, BECAUSE HE COULD NOT INGEST ANY FOOD ORALLY. ABOUT ONE MONTH HE SUDDENDLY RECOVER HIS ABILITY TO EAT THROUGH HIS MOUTH, BUT A FEW DAYS AGO THE FEEDING TUBE WAS SUCKED INTO THE STOMACH SPONTANEOUSLY, WHAT COULD HAVE CAUSED THIS ? WHAT ARE THE DANGERS.