Bought 2002 3.0 at Christmas, now 2K miles. Love the driving feel, luxe interior, looks. Trans Fail Safe light has come on three times when driving in Sport/Manual mode, usually after fairly aggressive acceleration. Warning light went away quickly each time after engine restart. Dealer talks about checking "camshaft sensor". Also, AM radio hisses all the time. Any thoughts? Any opinions on best BMW dealer in Washington, DC area?