I am working on the NT3H2211 along with the PIC24 micro.
communication between micro and nfc through i2c works normally, but suddenly its stop working, read write on nfc dose not work through the i2c interface.
after communication stop if i2c status register of the pic24 is checked it indicates that the master bus collision is detected.
communication starts working only after the control is power cycled.
You can try the I2C Soft Reset feature when the I2C is in the undefined state. By default, the feature is disabled so it will require a write to enable.
Here is a description of the I2C Soft Reset:
More information is available in the NTAG I2C datasheet: