Could you tell us your firmware version? Settings > System > About Phone > Software information
Do you mean the volume have become low?
Please tell me the app names and versions that have this problem.
Thank you 🙂
I am on the latest update of Asus for zc600kl (android 9, including latest update on security patch and sound), yet i think the sound is not yet loud enough as compared when at 7.1
Sound settings are on full, Audiowizard on smart setting