Like the Moto Z, you can put the phone in sleep mode with the fingerprint sensor as a more accessible alternative to the power button. (techradar.com)
The machine easily goes into sleep mode when not plugged in and would drop its connection to my wifi even while it was in the middle of downloading a film. (lifewire.com)
The only time I have a problem with it is after waking the eReader Pro up from sleep mode. (the-ebook-reader.com)