if u have 4000 miles on ur car with no starting issues u have nothing to worry about,at least i wouldnt think so..ive had issues within the first 500 miles.
basically any time the temerature of the interior is hot the car dosent recognize the keyfob and u cant push the button to start,sometimes it will start, then when u put it in reverse or anything it will stall out.
theres threads on other challenger forums about this issue, most people werent lucky enough as me to just get a new car replacment.