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TLV320AIC3204: SCL drop when TLV320AIC3204 response on SDA

Part Number: TLV320AIC3204

hi,

my customer found that the SCL would drop a little when TLV320AIC3204 response on SDA.

they measure the i2c SCL and SDA at TLV320AIC3204 side. They found that SCL has drop.

they measure SCL at master(ch1) and slave(ch2) side. Only slave side (TLV320AIC3204) has drop. It means that TLV320AIC3204 pull low on SCL signal when slave response ACK on SDA in pic below.

below is the schematic.

They don't find the issue yet. But can you help explain why this happens?

BR,

frank