I recently bought a Pixel XL (6 days ago) and I have not been able to get Google Assistant to answer me when I say "Hey Google". I have retrained my voice several times, rebooted, as well as a factory reset and it still will not work. I looked around online, and found there are several issues with Pixel - WiFi, camera-blurring and the microphone. I haven't run into any issues when I make phone calls yet (I have only made a few however) so I am inclined to think its a software issue and not a hardware issue.
Has anyone else ran into this issue? I am seriously considering returning the Pixel and getting a S7. I came from a Note 4 which I really loved and would have stayed with that line but then the whole Note 7 thing happened and decided to go with the Pixel. I am a little under-whelmed by the Pixel actually, but that is another story...
Look forward to others' experiences in regard to Google Assistant. I think it is something I would use quite a bit, if it only worked!