Hi There. I've had my Ultra two weeks now and love it but I too am having a problem with auto switching between HDMI eArc and Optical In.
When I turn on my TV the eARC input always wakes the Ultra and always automatically switches to the HDMI input. And ... When the Ultra is already awake, auto switching works seamlessly between the Optical and HDMI inputs going in either direction from one to the other.
BUT when the Ultra is in standby and I activate the device that's outputting the optical signal (in this case a Sonos Port), the Ultra will not wake. So if the Ultra is in standby and I send a signal to the Port, in order to get sound out of the Ultra, I need to manually go to the WiiM app > Devices > Browse > select Optical In. Is there are way for the optical input to both wake the Ultra and auto select the input?