Voice Recognition DF2301Q using I2C

I am using the Voice Recognition DF2301Q with I2C and Arduino.  Essentially I am using the DF Robot example program.

My problem is that the void loop freezes after a time and the program stops running.  This time before it freezes is not consistent.  I wonder if this is something to do with the I2C interface.

Anyone else has similar problem ?  Anyone got a fix ?  Thanks John