Crazy noise interference with dock connection in 1.1.3!?

I always use the dock connection to connect iphone to my car to charge and listen music.
It has been ok for 3 months.
However, after I upgraded to 1.1.3 devteam jb, once I connect the dock connector, there are crazy noise interference. I tried to switch to airplane open its the same.
I switched the phone off, the interference gone. I restart the phone, intereference comes back.
Is there something done with the new firmware update? Or sth from the jb??

Help.. the interference is so big that it affects me from listening songs..

so no one use their iphone dock connection to listen music!?