loss of power, maybe transmission?

What is your question?

i bought a 2002 330xi and had it for three days, i noticed it shifted hard into second gear but today i was driving uphill and i just lost power. it felt like the transmission was slipping, i was still able to accelerate but just about half as fast as normal. a light on the dash came on that was like a gear with a "!" inside of it. it did this then when i turned off the car for about 10 minutes it stopped doing that. and then it did it again and when i shut the car off again it stopped, any help witht this thankyou.