What are the common causes of gearbox failure in Audi 80 cars?

I noticed that my Audi 80 is having trouble shifting gears and sometimes seems to slip. What could be causing this issue and how can it be fixed?

The most common cause of gearbox failure in Audi 80 cars is worn out transmission fluid. This can be easily fixed by having the transmission fluid changed at regular intervals. Additionally, make sure to use the recommended type of fluid for your car.

Another possible cause is a faulty transmission solenoid. This component is responsible for controlling the flow of transmission fluid. It can be replaced by a mechanic and is not a very expensive repair.