I recently purchased a Toshiba Android Tv (model: 49u7750Ve). The tv would go to normal standby/sleep upon pressing the power button and resume it's activity when turned back on - like normal TVs.
But after upgrading the firmware to android 8.0R1, the Tv would only give the option of shutting itself down when pressing the power button and would take a good 30 secs to boot back up. The sleep/standby option has magically disappeared. Moreover, the bluetooth remote won't work when TV is shut.
Any solutions?
Did you check in settings if you can chose what the power button does?