Alexa wake up randomly....and others

Hi I have a raspian strech latest version I made the instalation following the guide and all seems going fine The issue that I'm experiencing are:

1. Alexa wake up randomly while I'm watching tv or while someone talking....but no words like alexa or echo comes out from tv or voices.....
2. If I ask alexa to decrease volume while I'm listening radio she stops the radio and the volume doesn't change......... I'm from italy so I don't know if it depends from the language.....but echo answer me in italian ........ Solutions ?