I let my friend drive one of my Z's (he was in one and i the other) when we stoped for gas he said "i think something is wrong every so often the car beeps" it turned out to be the key fob in his pocket. When he would move a certian way or make a turn at speed a button would get pressed. Do you have the fob in your pocket ? I also put mine in my pocket but it never happened to me maybe check it out. About the other noise bring it to the dealer and have a tech ride with you.
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"These Violent Delights Have Violent Ends"
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