If you frequently pair your iPhone with your car in order to play music over the speakers, you probably have controls on your dash or steering wheel that let you pause, play, and skip tracks without having to actually pick up your iPhone. Unfortunately some iPhone users have reported issues with these functions under iOS 7. Either skipping, pausing, and playing don't work with car controls or there is a serious lag. Regardless what issue you're experiencing, the good news is that there's an easy fix!
Full story from the iMore Blog...