I have set my TV to turn on and/or switch to Apple TV when the ATV wakes up from sleep. Until tvOS 10 it worked as expected but since I upgraded to 11 the other day, the TV switches to the ATV input every (exactly) 5 minutes with a message (translated, but something like this) "Multi purpose remote activated".
First I thought it had something to do with the screen saver since it was set to turn on after five minutes of idling but changing that time out to 10 minutes didn't change anything.
I have restarted the ATV, turned of WiFi on all other devices I have (to make sure they don't use the ATV for AirPlay) and put my ATV remote control in my micro wave oven (since it has a Faraday's cage), all to no avail.
What's going on here?
Update: After leaving the TV off for a day I turned it on and it worked normally for several hours. I then airplayed a youtube video from my phone to the ATV, which made the TV, as expected, automatically switch input source. When done I switched back to regular TV and put the phone in flight mode but five minutes later the ATV triggered again. This continued every five minutes until I pulled the plug on the ATV.