My understanding with the power save mode is that when theres no input for 4 hours or more that it will display a message and if no response to that message then it enters power save mode. Since you use the network to change and control the DVR, then maybe there is a bug you found but I would think that it would be the same as using Directv's iPad app to control and change channels. Should count as user input either using the remote or network control. You may have found a bug! 