I2C Communication is failed after a month

I am using ZL38051 Audio processor with RA6M2 microcontroller.

Using SCI I2C to control Zl38051. It was working fine before a month but now  i2c failed  ( I don't know why) .When I write something and try to read no I2C interrupt triggered.

R_SCI_I2C_Open return FSP_SUCCESS

R_SCI_I2C_Write return FSP_SUCCESS

R_SCI_I2C_Read return FSP_SUCCESS 

with or without Free RTOS. (FSP v3.6)

Regards.

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