Thank you for being with Samsung and sharing your concern. We would like to offer some troubleshooting steps to overcome the issue: 1) If Problem is existing on the Call. Check the Network mode setting (preferred GSM Only network mode) because some time sound problem can be occurred due to N/W problem 2) In Android JB or above check (disable) the Turn off all sounds option by navigating into Setting-->Accessibility-->Turn Of all sounds 3) Decrease the volume and then increase it again & avoid lamination on speaker. 4) Check media sounds and system sound by navigating into Setting-->sound setting-->volume 5) If problem still exist run the device in Safe Mode 6) if it still not working please reset the setting of phone by navigating into Settings >> General Management >> Reset >> Reset Settings >> Reset Settings 7) Periodic Software Update through FOTA, SMART SWITCH or Smart Tool is intended to resolve the issue as well. 😎 If the issue still persists create full Data backup & Factory reset the device. Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
