Our Cox DVR (record 6 shows at once) broke last week. Because it was the third time it has happened in the past two years, the technician replaced it with a DVR that stores recorded shows in the clo...
I don't have a DVR but I noticed Cox added HDMI-CEC capability to Contour last year. You could check your setting by pressing the Contour Button > Device Settings > Power Preferences > HDMI Device Control (On/Off) "When your compatible HDMI linked TV is turned off, your TV box will go into standby mode"
Also, a "hub" controls HDMI-CEC on a system, such as a TV or AVR, for its connected components. For example, if the TV is your hub and detects the disk tray has opened on a connected Blu-ray player, the TV will automatically switch its HDMI input to the Blu-ray player.
The hub is waking you at night. Are the TV and AVR unpowered or in Standby mode at night? There are 2 power buttons on the Contour remote. Use the [power off] All button.
playback on recorded shows in extremely quiet
As Mouth recommends, tinker with Expert Mode and if audio is still quiet, try PCM stereo. Although Contour describes it as "Stereo," the audio data may still be encoded with the additional audio channels for your AVR. Ensure your AVR is receiving audio data from the DVR as either PCM or bitrate.