Finished write on down stream... Error

Hello,
I try to make a bot like the "Alexa" from Amazon for my school project, and i found you on youtube...
So, my problem is, that I want, that my Alexa is listening "forever", but when I say nothing for a while, my program say's: "Finished write on down stream..." in the console. I tried to make the google speech to text as a thread, and i restart the theard every 20 seconds, but it doesn't work. But this time with the theard, it writes "Finished write on down stream..." 10 times at the same time in the chat.

I hope you can fix it, thanks

// https://pastebin.com/WY5izrkb <-- my code
// https://pastebin.com/QABMizRy <-- my console output