Hello @Craig_Reilly,
Thanks for your helpful insight, it is much appreciated. For your firewall to properly allow Roon communication you will need to open the ports listed in this thread here, these ports need to be allowed on all firewalls from NAS → Core → Switch (if managed) → Router:
Furthermore, I have enabled Diagnostics mode on your account and what this action will do is next time your Roon Core is active, a log report will automatically be generated and uploaded to our servers for additional analysis. Upon receiving the said logs, I will create a case for you with our QA team and let you know that they have begun their investigation as to what can be causing the random disconnects. I appreciate your patience here while we take a look at what could be going wrong, but in the meantime I kindly ask for you to give the above thread a read and make sure that you have opened the required ports so that we can hopefully eliminate the firewall from the equation.
Thanks,
Noris