Everything Instant On

After replacing my 3 airports with 4 AP-11 i could not see any of my apple TV's. After restarting the apple TV's they reapeared but after a few day theys are gone (AppleTV's are sleeping). 

Anyone experiences the same?

P.S. AP's start very slow, first I thought they were DOA's

I use 4 Apple TV boxes and don't have any issues. The Apple TV boxes are all connected through a wired Ethernet network, though. I suppose in your setup, the Apple TV boxes would connect through a wireless network and after some time you won't be able to see them through an App on an iPhone or iPad, like the Apple Remote using Bonjour, Zero-Config. This could be caused by some sesson timeout on the Aruba side, while the Apple TV boxes won't periodically re-authenticate. What is your setup excatly?

2x Apple-TV's 4K are wired with tvOS 13.2 - Switch Cisco 300-24G Sinds last restart of my whole network a few days ago they are still visible. Thank for your reply and i hope it keeps working PS Now trying to get Homebridge and Homekit to see eachother