Collak

Hello ya'all
So my car is at around 170k-175k kilometers.
it only had around 5km to have it to service(which includes gearbox oil change and other expensive stuff)
After going with it on a speed test, the gearbox was reacting like in the video below
So I had it driven back home immediately after showing up the gearbox malfunction.
then I noticed it was oil leaking, and it was the whole gearbox oil. Got it to audi service and it was the gasket of oil so they have changed it and put new oil on it.
everything was fine until 5 days ago, when car showed again for like 2/3 seconds the gearbox malfunction... Car goes just normal, no any other dissabilities from it, and again once more today, another same error...
What it could be? The gearbox doesnt seem to have any problem while driving, everthing seem to be fine...
any other of you had the same experience? What did you do with it and what you have done to get it fixed?
thank you very much for your time and response.