How to fix transmission slipping in Audi 80?

I noticed my Audi 80's transmission slipping while driving on the highway. The RPMs would suddenly increase without any change in speed. What could be causing this and how can I fix it?

Firstly, check your transmission fluid levels as low fluid can cause slipping. If the levels are low, top it up with the recommended fluid for your car. Additionally, a worn-out transmission filter can also cause slipping, so it's important to have it replaced regularly.

Another possible cause of transmission slipping is a faulty torque converter. If all other components seem to be in working order, have your torque converter checked by a mechanic and replaced if necessary.