Our Prius has conked out several times in heavy rain when driving at highway speeds. The display sputters and then the car stops functioning. An error message appears on the display but I canít remember the exact wording. After a rest of 10-15 minutes the car works again, but when this happens suddenly on an Interstate highway itís frightening. Has anyone had this problem and can anyone shed any light on whatís happening? I drive this car infrequently, so I never remember to ask the Prius dealer about this issue.