Hi,
I tried TeamViewer Host on 2 of my samsung phones. Both of them will disconnect after a certain time, so they are not on my list of online devices. I will have to click on the teamviewer host icon again for it to be online again. It's definitely disconnected, because right after I click on the teamviewer host icon, it shows that teamviewer is activating again with a yellow dot, before becoming activated (Ready to connect) with a green dot.