MSP430FR5739: I2C Communication Fail MSP430FR5739

Hello,

We are using MSP430FR5739 in our system. MSP430FR5739's job is to receive and send data by communicating with another card in the system via I2C. In this communication, MSP430FR5739 works as an I2C Slave. After an indefinite period of time, communication is disconnected and does not come back. That is, I2C interrupt cannot be received by MSP430FR5739. We are faced with an uncertain situation. We thought that clock stretching issue was happening here. Therefore, we tried to catch this situation in MSP430FR5739 through interrupt (UCCLTOIFG) by taking advantage of the 'Clock Low Timeout' issue. But there was no triggering. Does the master side need to control this situation? Our priority is to find out why this fail occurs. What could be causing this situation? We temporarily solved this problem as follows. When no data is received by MSP430FR5739 for a certain period of time (no I2C interrupt occurs), we disable/enable the I2C Bus of MSP430FR5739. The relevant piece of code that does this job is as follows. After applying this, I2C communication came back, so we could receive interrupts again. But this is not a good solution. Your ideas on this subject will be very valuable to us. Thank you in advance.

// Added to disable/enable the I2C Bus
EUSCI_B_I2C_disable(EUSCI_B0_BASE);
EUSCI_B_I2C_clearInterrupt(EUSCI_B0_BASE, EUSCI_B_I2C_RECEIVE_INTERRUPT0 + EUSCI_B_I2C_TRANSMIT_INTERRUPT0 + EUSCI_B_I2C_START_INTERRUPT + EUSCI_B_I2C_STOP_INTERRUPT);
EUSCI_B_I2C_disableInterrupt(EUSCI_B0_BASE, EUSCI_B_I2C_RECEIVE_INTERRUPT0 + EUSCI_B_I2C_TRANSMIT_INTERRUPT0 + EUSCI_B_I2C_START_INTERRUPT + EUSCI_B_I2C_STOP_INTERRUPT);

for (i = 0; i < 200; i++) // Wait 200ms
{
    __delay_cycles(8000); // Wait 1ms, ~1ms because MCLK = 8MHz
}

EUSCI_B_I2C_enable(EUSCI_B0_BASE);
EUSCI_B_I2C_clearInterrupt(EUSCI_B0_BASE, EUSCI_B_I2C_RECEIVE_INTERRUPT0 + EUSCI_B_I2C_TRANSMIT_INTERRUPT0 + EUSCI_B_I2C_START_INTERRUPT + EUSCI_B_I2C_STOP_INTERRUPT);
EUSCI_B_I2C_enableInterrupt(EUSCI_B0_BASE, EUSCI_B_I2C_RECEIVE_INTERRUPT0 + EUSCI_B_I2C_TRANSMIT_INTERRUPT0 + EUSCI_B_I2C_START_INTERRUPT + EUSCI_B_I2C_STOP_INTERRUPT);