Was driving my 1999 Ford Taurus at a speed of 30-35 mph after driving at 70-75 mph steady for about an hour on the hwy and then without any notice while driving, the speedometer dropped from 30-35mph to 0-5 mph and stayed at that for about 3-5 seconds and my car tried to downshift and deexcelerate and also drop the transmission into a lower gear all on its own without any attempts to brake or slow down from my current speed of 30-35 mph. It did this twice within 90 seconds of each time. Since I was less than a mile from my destination I made it safely to my location and haven't drove it since. This activity did not occur at all while I was driving on the hwy (41 North) about 10 minutes prior to driving at city speed of 30-35 mph after exiting for about 2 miles to my final location which did not require any stop and go driving except when I got off the hwy and slowed to 30-35 mph onto prospect ave in appleton, wi. I did notice a similar thing happen to my car about a year and a half ago, but at that time the only thing that happened was the speedometer dropped from about 55 mph to 0 a few times within 5-10 seconds but it did not try to shift to a lower gear like this time when the speedometer and RPM indicators quit on me while in operation.

- Wisconsin, WI, USA