hi

i bought an iphone 3gs with iOS 4.0, jailbroke it, was very happy no problem. i soon realized the bluetooth skips in my car every few seconds whereas my previous nokia e71 was flawless. i thought it was the firmware so i updated to 4.0.1. didn't help. i've tried all of the following from every resource i could find:

wifi on - ask to join off
wifi on - ask to join on
wifi off
auto lock off
shake accelerometer when locked
shake accelerometer when unlocked
reset settings
upgrade firmware

im really running outta options here... can someone PLEASE give me some advice