DFR0760 Speech Synthesis V2.0 Error Code "4" and "3" during runtime

Hi

I tried to run a new Speech Synthesis V2 Modul using I2C on a Arduino Mega 2560. I compiled the Example code. But as soon as the processor reaches ss.begin(); I see a code “4” on the serial console.. and the processor hangs (no further execution).

If I add the statement ss.reset(); bevor the ss.begin(); I get a code “3” on the serial console..  

I checked to I2C Address (0x40) and its visible and I have no address conflicts, there are no other modules on the bus.

What's my problem ? 

Regards 

Stefan