Aug 8, 2018
Exact same issue. I have Sony XBR-55X900E, Apple TV 4K, and the Bose Soundtouch 300. The Bose is connected to the TV ARC HDMI port, the Apple TV is connected to a regular HDMI port on the TV. The HDMI CEC is on in both the TV and soundbar. Once I use the Apple TV remote to sleep the system turns off (tv,Bose,Apple tv) however seconds later I see the Bose light up and turn on the TV while the Apple TV stays off.
this is a 700 dollar soundbar, issue needs to be fixed. Unacceptable.
Aug 18, 2018
I have the exact same problem. My TV model is 65X900E. It´s annoying because the Bose soundbar turns back on by itself and it turns the Tv on too.