Thank you for your asking. Kindly try some stay-at-home troubleshooting tips below:
1. Does the issue appear after any system/apps' download or update?
2. Please check on SMMI test
Calculator> type ".12345+=">SMMI TEST>Single Test>Speaker Test
If the SMMI test fail, kindly bring your device to the nearest ASUS repair center for device checking: https://www.asus.com/support/Service-Center-All-Countries/
If it is impossible to access the service center during Covid-19 period, please try Call us: https://www.asus.com/support/CallUs
3. Kindly clean your speaker, and remove the screen protector.
4. Please try to enter "Safe Mode". If the function works well in Safe Mode yet the issue remains out of Safe Mode, please check on any disturbance from the installed 3rd party apps.
# How to enter and exit "Safe Mode"https://www.asus.com/support/FAQ/1005163/
If you have any further queries, please do not hesitate to contact me.