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TPA3220: when AC off, there is POP issue

Part Number: TPA3220


when the AC is off , there is POP sound. We added the mute control circuit, but whenever we put /CMUTE low, the POP sound would come out. There are two problems:

1. Why does /CMUTE turn low to make POP sound?

2. How to solve the POP sound when AC is off?

the AC off Mute circuit:


the /CMUTE is pulled low ,POP sound come out wave 

2. Zoom in the POP around

3.Push /CMUTE directly to the ground with a touch of the switch, and you can see that /CMUTE pulls down while making a POP sound: