If your new Z2 Auto is randomly shutting off during the night, it may be the Auto Start/Stop feature misinterpreting a leak during the night. Turn off the Auto Start / Stop feature using the instructions below.
The Z2 is equipped with an Auto Start / Stop feature. This feature will start the treatment automatically when the mask is placed on the face and you start to breathe. It will stop the treatment after the mask has been removed. To restart the treatment, place the mask back on your face and start to breathe through the mask. The Z2 is shipped with this setting turned on.
NOTE: The Auto Start / Stop feature will stop the therapy if a large air leak is detected between the Z2 outlet and the mask. This may also happen at times when the mask is not being worn properly. This common condition should be resolved once all connections are secure, the mask is properly worn, and the Start/ Stop Button has been pushed or you start breathing into the mask.
NOTE: The Auto Start / Stop feature may not work with the use of a full face mask due to its design. In this case you will need to press the Start/Stop Button to start the therapy.
You can disable the Auto Start/ Stop Feature and start and stop the Z2 using the Middle Power Button. To do this press and hold the Up Arrow Button and Down Arrow Button at the same time until the Z-Breathe setting flashes. Release the buttons.  Then press and hold the Up Arrow Button and Down Arrow Button at the same time again until AOFF-ON flashes.  Release both buttons and press the Down Arrow Button to change to AOFF-OFF.  Press and hold down the Middle Power Button to save the setting.
To enable the feature, repeat the steps above, but press the Up Arrow Button to change to AOFF-ON.  Then press and hold down the Middle Power Button to save the setting.
If your Z2 continues to shut off during the night after the Auto Start / Stop feature is turned off, contact Breas customer service at supportUS@breas.com