Hello, Cynthia, I am an electronic engineer, and have a degree in Computer Science, and i see this issue occasionally, and it very possibly could be in the jack itself, and can be repaired, however this entails taking your phone apart, and putting it back together. Also there could be corrupted settings in the phone’s software, and a passive dart to throw, if you didn’t mind losing all your data which could be countered by taking a backup of your data, would be wiping the phone, then restoring the backup