Hi @Phil_Knowles and @Flavio_Fernandes
I certainly know the frustration from this problem. Looking at other posts I ran across a suggestion from @beka in Roon support and she suggested changing the dns and gave 3 ways to do it. I did some research and tried Cloudflare which changed the dns to 1.1.1.1. Lo and behold it completely solved the problem. I have not had an interruption in over a week. Hopefully you can achieve similar results.
Please let me know if it helps.