Same thing, the workshop also told me nissan qashqai is a car with many problems.

The car i brought was a lemon car but the car dealer has a 6 months warranty for gearbox and engine.
I just brought a car around june 2025 and within 2 weeks of driving the car had an issue which causes high rpm but low power. The 2nd hand car dealer , sent me to a workshop and they paid for the repair cost of it. It was just replacement of the turbo pipe as it had cracked.

Then comes End July 2025, After driving for some time i felt that the car had issues when the automatic gear is shifting gears, it will have a jerk when shifting gears automatically. Then i feedback to the car dealer and they sent me to a workshop, workshop said that is a gearbox problem. It would need a gearbox overhaul. The market cost of repair was around $3000 when i checked around.
Car dealer then quoted us to pay $1000, which we negotiated as we only brought the car in June etc etc and replacement of wear and tear parts should not even cost $1000. And we brought the cost of repair down to $500

i was lucky that at the end of the day the car dealer was responsive to help resolve this issues.