Automatic problem

Hello, I have a problem with the automatic of my Audi80 B4 built in 1994 78 thousand km down. Before 2 moants suddenly started spinning the automatic when I had to brake at 60kmh since I came to a traffic light there was a jerk and when I wanted to give back gas he did not switch up again but took gas. Right turn, engine turned off, made again and everything ran normal again. The next day the same problem, again at 60kmh and the same story. , error reading made FEHLER gear monitoring additional information from the control unit to the error code unplausible signal sporadic cause coupling slide box workshop said I should go on for the first time That went 6 weeks well and the same story started again I had to stay to AUDI car ATF change made in error memory this time nothing was filed Audi said can’t fix anything udn maybe it was the ATF cost230Euro Then last Friday (about 3 weeks after I was at Audi ) again the same game, but now I drove to another workshop and got yesterday the message that the gearbox was down and a replacement gearbox has to be pure. cost 1800Euro Now my question: Can it be that now suddenly no mistake has been made? And how does it get shorter and shorter the intervals where it starts to spin? Can it be something else? The dare is otherwise good in shot and has not really got much down yet. Info…I am a woman and have the as feel that I am always told about the horse in the workshops.