Sound issues after updating to ios14.4.2

After updating, when I was trying to change the volume by pressing the buttons, the volume changing delays an obvious amount of time.

Besides, if the changing of volume is so fast to some extent, the sound output will be super delayed and the sound muted from time to time.

P.S even when I am typing, the key board

sound effect is muted from time to time and so delayed

Is there any way to fix it?