Radio/tape Cd Player Problems of Volkswagen GTI

I purchased a new 2010 voksawagen Gti in the beginning of November 2009. Only a few days after I took delivery of it I started having issues with the braking system. I was driving home going the speed limit around a long turn that I have been driving for 7 years now and all of a sudden the car made a feeling like I had ran over something big or had a flat tire,I was not pressing on the brakes or hard on the gas,I was just driving normally. I pulled over and I could not find any damage to the car or a flat tire. I got back in the car and went back to the turn and there was nothing in the road and it was completely dry that night to. It felt like a grinding crunchy feeling and sounded like a flat tire grinding on the pavement or something crunchy,it also slowed the car down a little bit. I took it in to the dealership and they had it for a week and when I picked it up they said they could not find a problem. I drove the car home and a day later it did the same exact thing,a few days after that I was getting off the interstate I went to press on the brakes and my brake pedal was solid so I had to downshift to slow down,having no brakes is very scary,the next day it rained for the first time since I had the car and the sunroof started leaking and then a few days later the radio started turning down and muting by itself,I took the car in again and the dealer had it for 3 weeks and when I picked it up all they had fixed was the sunroof. I demanded someone come out to drive the car and he got it to do the crunch going around a turn and a few days later he said it was normal,if its normal why doesnt it do it everytime?it still does the chrunchy thing a few times a week and the radio is still acting up on a daily basis and wouldnt let me press on the brakes yesterday going around a turn. The dealer says its working like it should but I dont see how if I cant use my brakes when I need them, its very dangerous and scary. I have been keeping logs and miles when these problems occured.

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