Hi
ikhsanpangestu2105Thank you for your asking. I just tested my device the afternoon, yet I didn't have the same issue. Kindly provide the information below so that we could better assist you.
1. Does the issue appear after any system/apps download or upgrade?
2. Your current firmware version
Setting >System>About Phone>Software information
If you try to update to the latest version, does the issue still remain?
3. Check on Sound Settings, make sure you have open "Media volume"
Settings>Sound
4. Please try SMMI test
Calculator> type ".12345+=">SMMI TEST>Single Test>Speaker Test/BoardMic Test/Headset Test/Headset Mic Test