I assume the host goes offline after a period of time. I just quit using it altogether because I could never reliably remote in after a certain version.
I can restart the service or exit the system tray icon and restart and can access another machine for about 15 minutes. Then it stops working again.
When on-site, it's not a huge deal. When off-site, it's a big deal because I can't get to machines. I just use a VPN and use VNC internally from a jump box now.
I tried a VM, physical machine, removed our AV, fresh install, etc.. I have issues with all of them. Even when they show online, when I try to connect, I can't.