I had that problem a lot as well. I removed Siri and now I just accidentally mute my machine. That being said, my typing accuracy has improved as I've gotten us

I had that problem a lot as well. I removed Siri and now I just accidentally mute my machine. That being said, my typing accuracy has improved as I've gotten used to the keyboard, so accidental touches are pretty infrequent now. My girlfriend just received her TB machine and she does it all the time, so I think it is something that improves over time.