Temporary failure of the brake power amplifier??

When I only had my new XC60 for a few days, I noticed once (unpleasantly) that the car could hardly be braked after the start (and instead the electric motor still pushes a little bit). About as if the brake power amplifier was without function. The pedal feeling is like stepping on a concrete block. The whole thing was just like that after the start. Even after 5-10m everything was “normal”. I then at first somehow “dumped” it or in the contact But now – months later – it happened to me repeatedly within a few days. I start the car and want to slowly get out of a parking space and you have the feeling that you can’t slow down the car despite the slightest speed. You have to put your entire body weight on the brake pedal. In the meantime, I don’t feel it’s just “uncomfortable” anymore, but also potentially dangerous, because of the situation. n – when it comes – comes as a surprise and then it may not always be fast enough to get enough weight on the brake pedal. Especially if you are in a parking space that does not give you enough space for a slow braking manoeuvre. If it comes, it is irrelevant whether the car has been standing for 2 hours or 2 days before. I actually have the impression that something is wrong here with the brake power amplifier. I will soon – if the first annual inspection soon has anyone already experienced something like this?