The Doze feature kicks in when your screen has been off for a while. This disconnects your phone from WiFi networks and prevents apps running in the background from draining your battery. WiFi should reconnect when your screen is turned on.
The Doze feature should not prevent you from receiving calls or text messages. If calls and messages are not coming through while the screen is off, please contact Republic Help.
For more information on Doze, see What is Android's Doze Mode?
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