Good tip and appreciate the input, but I am thinking you must have one of the newer 4k/4k+ devices and not the Roku Premiere referenced in this thread. (Settings/Systems/About to determine your model number).
This power savings feature capability was introduced with the newer Realtek chipsets of the newer line of Roku devices.
Although recommended to disable this feature as you have done (it is causing some issues, reportedly), pressing Home on the Roku Remote should wake the device up if you leave this setting Enabled.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102