This is a common problem i know many of you are facing but might not actually know how to go about fixing it. I searched all over the internet to get a lasting solution to this issue but all failed. I noticed when ever you use your smartphone headset on mostly Nokia phones, it will automatically activates the microphone feature so the next time you use it with your smartphone, it will keep popping up google voice app.

How Can I fix This Issue?

Although, I have not gotten a lasting solution to this issue but with this little am able to put together you can actually fix this issue temporarily.
==>Open settings>>Applications>>locate google voice application click on it.
==>Right down click on disable google voice application.
So the next time you input your headset, it will not popup again.

source:http://www.techfashy.com/2016/11/how-to-fix-google-voice-app-popping-up-after-inserting-headset.html?m=1