Just did that… The Hub was disconnected for more than 5 seconds and rebooted afterwards. After starting the Vero activity, it sat there for the mentioned 5 seconds and then worked without an issue 
What I did is basically what’s described here: Configure Harmony Elite + Hub with Vero 4k/Kodi - #24 by Nickelig
If you’ve configured it differently, I’d recommend trying that guide first and testing with that - ergo getting as close as possible to my setup 