Voice stop to speak in italian and mix some other languages after few minutes (Android)

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The bug appears every time, after some minutes of travel, and the voice stop to speak in italian and switch in a funny mix of english, italian and in another languages i didn't recognise! :) Probably, (but i'm not sure of this), the problem appear after a short lack of mobile signal of my smartphone, or when i pass trought a round (the tts call the round something sound like "apferandavut"). The bug appear in any case i have activated or not the possibility to pronunce the name of the street.
Thank for the attemption.
Best Regards

Luca