Its more than 2 days I have face this problem. When I press headphone buttone the walkman start but now its not working. Hedaphone buttone works when I receive call but not with walkman....
Try to restart the phone? Blow down the 3,5 mm contact to remove any kind of dirt. You can also try to clear data for the Walkman player under settings > apps all > Walkman > clear data.
