Dodge Avenger Transmission Problems

I bought a 95 dodge avenger a couple of years ago. Got the car for 1,500. Low milage for it's age. I have had to do front end work on it since I have had it, and the brakes. But the problem is I will be driving down the road and I will lose third and overdrive. I can pull over it kicks hard when it down shifts. Wait about three to four seconds start it back up and it runs great. Could anyone have any idea why the transmisson does this? It does not do it all the time though. I love my little car it runs great except for this little problem
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Kitchenwitch
I replaced the speed control sensors and it shifted fine after that
I got them both off of ebay input and output sensors cost me 20 for both
speed control sensors tell the computer when to shift and how fast the car is going